Dianna throws out about 400 interesting facts all related to cavitation and still says "that's it, that's all I've got". Girl, that was plenty and that was awesome!
Wes Tolson, Hah! Potential student/fawning sycophant: “Do you know karate?” Fake Master: “No, but I know the ancient and mysterious art of Con Fu!” (Sound effects)
Nice one! Please thank your father for me. Never seen that before I just assumed thresher sharks had those tails because they look cool! lol Had no idea they were actually used as whips and was a really amazing thing to see!
You really have a great talent for communicating science, for making physics understandable, relevant, and a lot of fun. This episode was especially fascinating. Thank you.
@QED LOL, especially that dude 'cause he has a big brain but can't use it to buy the right tools for the right work. The woodpecker is excusable, has a tiny brain and limited options.
@@davemwangi05 i know that woodpeckers have tongues long enough to wrap around the back of the heads for cushioning so probably no long-term damage; it is how they eat after all
@@sakanagakyoko The sweat boiling away keeps you from instantly being roasted by the radiation; and you can close your eyes. That leaves the nose (and throat, and probably lungs, too) with steam pushing out at an uncomfortable rate. With air the pressure difference would be less than one atmosphere, but boiling water expands.
Physics Girl: "All that's left to do is try to blow your mind." Proceeds to talk about cavitation bubbles in your skull causing brain damage. Me: "I see what you did there."
@@physicsgirl Hey Dianna Here's one from one of your favorite topics One of the reasons that clothes and utensils are washed in warm water is that warm water reduces surface tension of water But clothes are washed inside the water, not on water surface
10:31, she says "that's it, that's all we got" with such an adorable disappointing expression, after throwing like 200 cavitation facts, and I must watch this whole video a couple of times more to get it all right 😅😅😅
I'm a naval engineer so this is right in a wheelhouse and I just want to say that you did a great job explaining this phenomenon! it was also cool to see that this applicable to other fields and being used to help people instead of just being a pain for me.
I love the sympathy in your voice when you talked about head trauma. This isn't just physics, it's people who are suffering from this and you treated it in that way. Thank you.
One of my all time favourite UA-cam videos and top two Physics Girl videos. I rewatched this today after her friend’s update on Dianna’s health. Please get well soon. ❤
Diana unveiled some guarded secrets of nature, I think She should of received protection after releasing this, hope she makes it through. Stan Meyers and many others were working on over-unity devices also, we all know what happened there.
When I was in architectural design, one of my teachers introduced us to cavitation in old water pipes. In rigid piping having a fast stream of water that is shut off abruptly can cause cavitation that can shake the lines and cause damage.
I love that you don't talk down to your viewers, but you're able to make your topics accessible and understandable to those of us who aren't in physics!
Wow. This is definitely one of the most interesting things I've ever learned, for real. Especially the last fact about brain damage blew my mind (figuratively, thankfully).
@@zemoxian and I'm so glad the mechanical engineering school I go to explained in depth regarding both. And uh, as interesting as they are, they're some really annoying phenomenons when it comes to mechanical systems
Awesome! Care to explain how it targets specific tissues in a little more detail? I have to admit that when she explained it in the video I scoffed a little because it sounds like such a non-specific and violent way to treat cancer.
Love it whenever Euler is mentioned. Such an important mind in the engineering sciences: cavitation (as here), and (for structural engineering) Euler-Bernoulli beam theory, and Euler buckling. ‘Literally’ what we stand on to reach ever greater heights in engineering; without him, we’d ‘buckle’ under the load; we might even ‘bend’ at any ‘moment’; I’ll stop now, before my ‘stability’ is questioned (that one was a bit of a stretch, I admit...)
Other than how it was described was a failure in the interfacial properties of water and solids - when it is actually due to the material properties of fluids and self-surfaces (the potential energy increases through the generation of potential new surfaces of different energies). So Euler got the gist of the displacement causing an inertial problem - but didn't understand the energetics of fluids or surfaces enough to explain what he thought.
A bit like that quote. Not Mark Twain, as he died before the quote is attributed to him and it isn't in his literatute. It is possibly Johnathan Swift. See Quote investigator dot com for details.
@let's talk about George Floyd's Toxic Masculinity but you can say, a lie that the right spot from the left are peripheral there for ''rare'', while the left, a lie is the main stuff that they have to deal with from the right, historically.
Ever heard about "The Tortoise and the Hare" story? The truth might not spread as fast, but its shoes will eventually allow it to reach much much further
@let's talk about George Floyd's Toxic Masculinity Means so much less in an era where "lie" is equivalent to "anything I don't want to hear." Traditional conservatism doesn't really exist anymore in the US (at least not in the Republican party where everyone thinks it should be. The closest thing to traditional conservatives in the US these days is the so-called "establishment" Democrats.)
I saw the title and thumbnail of this video and thought: "Huh, maybe what I was told is not right at all." Turns out, the video explained what I knew, but gave me a much better way to describe it, and a better understanding of it! Not only that, it introduced sonoluminescence. Man, had I entered physics instead of engineering, I might be even more all over that!
@@revimfadli4666 True enough, most engineering fields go hard into physics, but most fields only go hard into a small field of physics. Arguably, so does physicists, but they still get a lot better understanding of all kinds of physics compared to engineers. But to answer your question: Electronics Engineering. I have a good amount of knowledge of physics when speaking of electricity, but very little knowledge when it comes to most things in this video. Especially sonoluminescence, since, as she mentions, it is a field where we don't know all that much.
As soon as you mentioned the propellers (we call them screws in the Navy), I immediately knew it was cavitation. I was a Machinist Mate that worked in nuclear power plants in the US Navy 30 years ago. One of the things we had to study was cavitation in centrifugal pumps. We use centrifugal pumps to feed sea water into the heat exchangers of the reactor plants. Any cavitation there was dangerous, so we had to constantly monitor the feed pumps for speed and pressure.
Cavitation is also a huge factor to deal with in pump design and can also happen in plumbing and on the shut off side of a valve - google cavitation in pipes and pumps and there's a whole world of applied engineering there! Thanks Physics Girl you rock!
@frzstat ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action , 1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) , 2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created , 3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets ) 4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure . And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state . .... could that be right ? 🧐🇬🇧🤔🤓
As an interesting side note, cavitation is also the reason for the noise of the "popping" sound you get when you crack your knuckles - or when your back or neck "cracks" when you move it certain ways, or even when you put some joints under a particular load, eg ankles cracking when you stand up sometimes after kneeling or crouching for a while. In these cases it's all about a specific, often sudden, pressure drop in the synovial (joint) fluid as the joint is partially tractioned (surfaces pulled apart). Unlike, as with propeller cavitation, the cracking/popping sound occurs as a gas bubble is formed - not as it collapses - and is the reason why a joint can't be re-"popped" for at least a few minutes. This is because the "pop" is the sudden release, or gasseation, of previously dissolved nitrogen from the fluid into a bubble rather than gasseation of the water molecules themselves. To "crack" the joint again it is necessary for the nitrogen to re-dissolve in the joint fluid and attempting too soon will not achieve the required sudden drop in pressure because the gas bubble will expand as you try. BTW, this process is completely harmless and has no effect on the joint surfaces, in case you were worried! It categorically does NOT increase your odds of developing arthritis.
>and is the reason why a joint can't be re-"popped" for at least a few minutes Uh... voca.ro/12vWmX7aFap (might have to crank the volume; maxed out the gain on my microphone but it's acting up with its volume levels so the vocaroo recording is quite low, or my headphones are acting up and messing up playback) - that's me cracking the knuckles of my left hand 3 times in quick succession by setting my finger tips against my upper palm then squeezing them together, if you imagine tightening a spiral forward & down (this is done just with the hand itself, not using one hand to crack the other). I can do that pretty much indefinitely with both hands, but it starts getting uncomfortable & painful after a few. Using one hand to press the upper finger down until the knuckle cracks only works every once in a while though, as described. I wonder what it is that's happening when I do the indefinite squeeze crack thing.
@Scientific Humanist yeah, it's far better explained, on many fronts, by tendons or ligaments being caught on something, then snapping back into place.
I did know how this works but I've never seen good footage of it. The short section from 06:19 shows how this works absolutely perfectly. It's really clear how the fracture occurs just after the cavitation bubbles collapse. On an unrelated note, my daughter (14) was telling me how much she had been enjoying her physics lessons since she went back to school. I think she would enjoy your videos so perhaps I shall have a physics girl for a daughter.
This genuinely blew my mind. I've seen cavitation in the Mantis Shrimp and behind boat propellers but to see it in slow motion with the bottle trick was absolutely amazing!
FFO Dianna. I ran into cavitation in a chemical manufacturing plant. We had a situation where a solvent was evaporating in a pump and causing cavitation. When they pulled out the impellor, though the mechanics were pulling my leg. The bronze impellor looked like it had been attacked by termites! It is the strangest thing to see and until you understand what is causing it, it can be a mind-blowing experience. Thank you again for your continuing effort to educate us.
I've been breaking bottles like this with my hands for a few years as part of my magic act, I always had a suspicion it wasn't exactly as it seemed, but this is pretty cool to learn, thanks.
That propeller thing was a part of a welding class. Do not think I have much to add, but it is an important part of estimating how long stuff like that will last. Like the forces of those tiny bubbles was described to contain baffeling amounts of PSI, so much that it can not be combated by using the stongest metals known to man. I think this is the forces that makes waterjets so efficient to cut hard materials.
I remember seeing a documentary years back about sonoluminescence. The researcher was creating flashes of light in a tank of water using just the right frequency of sound and showed the slow motion cavitation bubbles. My younger self was like "definitely going to be a source of cold fusion"!
Intelligence and the scientific method are so awesome. They can not only blow your mind but completely destroy the answers that are simple, neat and wrong.
Oh, three years ago! Good for him! And for you! Maybe the best presenter gets the audience.... And regarding “3 years ago”.... I went to Karlstad Mekaniska Werkstad in Sweden 1974-ish and actually watched a large propeller with adjustable propeller blades running in a closed tube system filled with water which was circulated in the tube loop by giant pumps and it had a transparent section illuminated by a stroboscopic light synchronised with the propellers revs/minute so the motion was “freezed”. There you could see the influence of water speed, revs/minute and blade inclination on the cavitation phenomenon and where on the propeller blade it would occur. Karlstad Mekaniska Werkstad was founded in 1860 ..إبراهيم عبدالرحمن
@@tomfull6637 No one ever said that cavitation is a new discovered phenomenon. Besid your fancy story, we are talking about that exact event with the bottle and what is acctully happening in that EXACT CASE. and if you searsh in youtube u will actually find few vidoes actually mentionning this exact phenomenon even before Mark
Honey's the only one you didn't explain! You explained the others! That's the one i was curious about! lol 'You use cavitation to make honey flow better by using cavitation to make it flow better.'
5:56 cavitation is also a problem for automobile water pumps with plastic blades. Eventually little pieces break off and get sent through the engine cooling system. As the water pump internals degrade so does the effectiveness for the pump to pump coolant.
Exceptional video. I have translated a number of documents involving cavitation and its undesirable effects, but I was unaware of the mechanics of this process. Plus, you know, science!
@Everything #English with KSL ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action , 1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) , 2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created , 3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets ) 4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure . And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state . .... could that be right ? 🧐🇬🇧🤔🤓
If you want to see more slow motion footage of this phenomenon, The Slow Mo Guys made a few videos on it almost 7 years ago. One was the bottle trick, and two other videos were about firing guns underwater with Destin from SmarterEveryDay.
@Afluka ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action , 1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) , 2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created , 3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets ) 4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure . And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state . .... could that be right ? 🧐🇬🇧🤔🤓
This was amazing. You talked about the light formed. I am curious if when particles are accelerated or excited enough do they then create a moment of wave? Becoming light for just a moment in time. Just a thought.
Woah. That slow-mo footage at 6:19 is amazing! It captures almost perfectly what is happening. I was going to explain how I was able to surmise what was happening from it... And yea it's what you use to explain, of course. Really great footage.
yea i think the jist of it is; as the co2 bubbles are dissolved under pressure, when a cavity appears the co2 immediately begins diffusing into it, which in turn would dramatically reduce the force of the cavity collapsing
SublimeSparo Thank you for the reply. My understanding would be that the distributed nucleation sites are formed as a result of the force created at the time of collapse of cavitation and not time of formation. It seems that my understanding of your statement is that the CO2 begins to dissolve into the cavitation as it forms? If that were true wouldn’t it lead to larger volume of cavitation? Wouldn’t larger cavitation have a greater kinetic energy?
@@erikthompson404 I think what he is saying is that the reason cavitation is so damaging is because of super low pressures, which "pull" the liquid around at incredible speeds. If the gas diffuses into the bubbles before it collapses, the pressure inside it won't be as low, so the speed(and by extension, the energy) of the collapse will be lower.
I think of it as a fixed amount of energy in spread out over a larger volume therefore each Cavitation bubble being less energetic and diffusing the shockwave.
@@Sublimeoo No - I don't think diffusion of gas into the cavity is a prime factor - but rather the fact that numerous cavities are formed, thus modifying the pressure fields. The fact that the cavities form is very likely to be due to the concentration of nucleation sites (which are a function of the reduction of surface energetics of having a dissolved gas - ie gas "liquefied" under a higher pressure). The pressure drop induces gas to transition to gaseous form, thus creating nucleation points for cavitation. Diffusion of gas from fluid to cavity increases the pressure in cavity (reducing the relative pressure differential), thus seeking to reduce the overall effect of the cavitation and reducing the resultant collapse (so if anything diffusion would seek to reduce the impact of cavitation)
I recently had to write up a guidance regarding Water Hammer/Fluid Hammer. This subject is very common in industries where pumps and steam is used. This explanation is right on. I wish i would have seen this when i was writing up the section.
Two points, I first discovered the power of cavitation when attempting to mix the contents of a sealed glass bottle by forcefully smacking the lid with my hand instead of shaking it. I'm now wondering if the noise associated with the concept of water hammer is not so much due to the force of the water against the valve but really cavitation in the pipe leading up to the valve.
Oh! So that's what is happening to your submarine in Subnautica when your ship's vocal interface announces the word "Cavitating" Many thanks for another fact filled video Diana [:=
Now I understand a thing that we did in our teenage years in our friend group. When we were drinking beer in glass bottles and someone was distracted someone took the bottle and give the distracted person I little *clonk on the top and the beer starts to foam
If you do it hard enough you do shatter the bottom of the bottle. I was quite astonished when that was done to my bottle. Also, quite sad because that was a waste of good beer.
Excellent job on Cavitation and what all it does you Covered areas that I have delt with often in my lifetime and did an Excellent Job Diana I am so happy that I have found you here!! I have missed watching you with my Grandchildren on PBS I love keeping young minds thinking about every aspect of our world and the Physics of this world we live upon and the UNIVERSE as well, your research is great on every topic!!! Keep up the Excellent work and I am still a admirer of your Works in explaining and exploring the information available...
@@mikew1332 That problem is decades old. Subs of any nation have developed propellers that don't cavitate if used correctly. The Russians have since developed a torpedo that deliberately cavitates. Not its propeller, but the torpedo "Shkval". Try to find out what sunk their Kursk in 2000.
@dodorichard ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action , 1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) , 2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created , 3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets ) 4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure . And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state . .... could that be right ? 🧐🇬🇧🤔🤓
DrumLife she went to famous prop maker in New Zealand to have a full body mantis shrimp businessman costume made for her. She has also appeared on physics girl.
Cavitation is essential in phacoemulsification, a type of cataract surgery. It is amazing how things can relate with some physics phenomenom. Like something responsible of a propeller destruction is what brings sight back to people.
I learned a lot from this video! I worked in a boat yard about 26 years ago and was told to install metal/alloy or aluminium sacrificial propeller savers on the rear of boats, when I asked what they did My boss said the piece or alloy would corrode quicker than the propeller this saving it before it’s next service. Not sure if it’s related but the pictures of the damaged propellers reminded me of that time. Fascinating stuff! 😊
This is a great video; so many interesting facts and it's really well done. I'd like to know how in the world someone discovered this phenomenon with the bottle. And I've watched many, many shark documentary shows on TV and have never seen the thresher shark with the whip tail until now. You'd think I'd have seen it on one of the shows.
I can safely say I knew enough on cavitation to hold a conversation, but this is a whole other level! It was very interesting and I learned a lot! Thank you!! Follow up question: do you think cavitation also occurs in the brain in hardcore soccer headers?
Hehe, Mark Rober and the Backyard Scientist made the same experiment in the backyard in shorts, while Diana is wearing safety googles, gloves, a cloak and she is doing it above a tank. Thanks Diana for showing an example! Safety first!
The two explanations are totally different. Mark says that it is the water coming back down that bursts the glass. I think Mark's is better because his would explain why carbonated water does not break the glass, as the nucleation caused by the tiny air bubbles for carbonated drinks would fill in the space when the bottle goes down, cushioning the glass and making the water go down slower. In Diana's explanation, the bubbles are weaker but there's no explanation.
She did explain it. The energy from the cavitation is dispersed into forming nucleation sites for CO2 bubbles to form. You can see it directly in the video.
@@billyjoethethird8436 well i think its definitely the created CO2 gas that fills the bubbles aka counteracts it. regarding water coming down. idk. her point was that its shockwaves.
The cavitation in carbonated water causing nucleation sites is so cool. I love it when different cool physics things combine to make temporary shock mentos
@Physics Girl ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action , 1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) , 2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created , 3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets ) 4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure . And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state . .... could that be right ? 🧐🇬🇧🤔🤓
might be the same subject, but a different take on it. Allows people to absorb the info, some might like watching her instead :) or some people will be able to understand her better than his take on the subject :) either or, great video about it and very informative
The part that she explains and shows why it doesn't work with carbonated beverages helped me understand the other party trick. Where you bonk somebodys drink and it al spills out of the top with force. I love that they all made a video on the topic and I learned from each of them something new.
‘Why head injuries could possibly be more traumatic than we ever knew” Me, a girl with a traumatic brain injury: uhhhhh...yeah. TBIs are incredibly detrimental to life. I’ve changed completely since my brain injury. Haha.
It's great that she managed to film it and prove the mechanism is related to cavitation but I'd still like to see a CFD simulation of it because I think there might be more going on in this experiment related to presurre waves reflection at the bottom of the bottle and maybe even shock waves in the air-liquid interface.
A well informed science talk and suddenly at almost 7 minutes pressure is measured in pounds-per-square-inch. I felt a great disturbance in the Force, as if millions of voices suddenly cried out in terror and were suddenly silenced.
You are absolutely delightful. I hated physics at school. Too bad you weren't my teacher 50 years ago! Brilliant stuff. So happy I chanced upon your vids!
I work in sterile processing in a hospital. We use "sonic cleaners" to do a final cleanse after manual cleaning. The sonic cleaners use cavitation generated by sound waves to clean nooks and crannies to small for us to clean effectively by hand.
Cavitation is also a thing in diesel engine cooling systems. The frequency of the power stroke essentially bathes the cooling jacket side of the cylinder in Cavitation bubbles. This eventually leads to erosion that eats all the way through the wall of the cylinder. To combat this, we use additives(DCA) to the coolant. The way I understood it, it changed the viscosity/ resonant frequency of the fluid. Thus, reducing the cavitation effect.
One of my recent research topics has been to study cavitation in plants and ultrasound emissions from plants. Diana if you want to make a short podcast/video about the topic, I would love to be a part of it.
I saw Mark Rober's video on this a couple months ago, but you introduced so much more knowledge on the topic! I didn't know any of that stuff about cavitation in boat propellers!
Dianna throws out about 400 interesting facts all related to cavitation and still says "that's it, that's all I've got". Girl, that was plenty and that was awesome!
Also, why is no one talking about the bandage on her finger?
@@epsilon1563 Relevance? Anyway, she mentioned this in an earlier video.
@@suijsj She explained it at the end. Also, thanks!
and I am sitting here with 2kg of thick honey wondering how to apply cavitation so it starts flowing. I need more details!...
Amen!
Not that long ago, the bottle popping trick was used as a demonstration of "chi energy" by martial arts masters!
Punching a water melon gives you any ideia.
I should keep my beer bottles and sell Chi Energy on Ebay.
Anyone making up stories about manipulation of chi energy is not a martial artist, they're a con artist.
Wes Tolson, Hah!
Potential student/fawning sycophant: “Do you know karate?”
Fake Master: “No, but I know the ancient and mysterious art of Con Fu!”
(Sound effects)
Arsional fart masters*
You can't be in every math and physics problems ever imagined
Euler: Yes, I can!
Newton: did someone reckon me!
Von Neumann has entered the chat
Euler was Euler
If Euler could have lived long enough AND invested in Tylenol he'd be the richest man ever just based on the headaches he's caused! lol
What a madlad he was....😂😂😂
That's my Dad's footage of the Thresher Shark attack! What a surprise seeing that in a physics video.
Wow! Nice
Damn, that's dope! Please say hi to your dad for me!
wow your dad must be so cool
That's so neat! This is the coolest thing I've learned in a while. I'm in awe.
Nice one! Please thank your father for me.
Never seen that before
I just assumed thresher sharks had those tails because they look cool! lol
Had no idea they were actually used as whips and was a really amazing thing to see!
You really have a great talent for communicating science, for making physics understandable, relevant, and a lot of fun. This episode was especially fascinating. Thank you.
Ok, cranial cavitation bubbles is the most horrific thing I’ve heard today. That’s for sure.
Made me wonder about that famous dude who uses his head to hammer nails in wood.
And a woodpecker.
Yup, Brain bubbles made me say ouch
@QED LOL, especially that dude 'cause he has a big brain but can't use it to buy the right tools for the right work. The woodpecker is excusable, has a tiny brain and limited options.
@@davemwangi05 i know that woodpeckers have tongues long enough to wrap around the back of the heads for cushioning so probably no long-term damage; it is how they eat after all
Right? And there's really nothing we can do to prevent it.
If you were to spit outside at 60,000 ft, you would have a lot more to worry about than your spit boiling
@Scientific Humanist lack of breathable oxygen before you would have time to freeze
:D
Imagine thinking you are somehow original :D
What about your sweat, eyes and nose fluid boiling huh
@@sakanagakyoko The sweat boiling away keeps you from instantly being roasted by the radiation; and you can close your eyes.
That leaves the nose (and throat, and probably lungs, too) with steam pushing out at an uncomfortable rate.
With air the pressure difference would be less than one atmosphere, but boiling water expands.
Like, lack of oxygen, subzero temperatures, lack of atmospheric protection from the sun’s rays, and how to get back down?
Physics Girl: "All that's left to do is try to blow your mind."
Proceeds to talk about cavitation bubbles in your skull causing brain damage.
Me: "I see what you did there."
Oh.
400th like
Yeassss that was definitely on purpose.
@@physicsgirl PUN CITY
@@physicsgirl Hey Dianna
Here's one from one of your favorite topics
One of the reasons that clothes and utensils are washed in warm water is that warm water reduces surface tension of water
But clothes are washed inside the water, not on water surface
The music at 6:19 is so perfectly synched and well chosen.
10:31, she says "that's it, that's all we got" with such an adorable disappointing expression, after throwing like 200 cavitation facts, and I must watch this whole video a couple of times more to get it all right 😅😅😅
There is a lot of research as I understand. I'm just stunned by the quality of the explanation.
Stunned like a fish hit with a cavitation bubble? :-)
Mark roger made a great video about this with backyard scientist.
Mark rober already did this
Definetly
I'm a naval engineer so this is right in a wheelhouse and I just want to say that you did a great job explaining this phenomenon! it was also cool to see that this applicable to other fields and being used to help people instead of just being a pain for me.
As a Marine Engineer, I agree :)
I love the sympathy in your voice when you talked about head trauma. This isn't just physics, it's people who are suffering from this and you treated it in that way. Thank you.
One of my all time favourite UA-cam videos and top two Physics Girl videos. I rewatched this today after her friend’s update on Dianna’s health. Please get well soon. ❤
Diana unveiled some guarded secrets of nature, I think She should of received protection after releasing this, hope she makes it through. Stan Meyers and many others were working on over-unity devices also, we all know what happened there.
When I was in architectural design, one of my teachers introduced us to cavitation in old water pipes. In rigid piping having a fast stream of water that is shut off abruptly can cause cavitation that can shake the lines and cause damage.
I love that you don't talk down to your viewers, but you're able to make your topics accessible and understandable to those of us who aren't in physics!
Wow. This is definitely one of the most interesting things I've ever learned, for real. Especially the last fact about brain damage blew my mind (figuratively, thankfully).
It’s up there with Leidenfrost weirdness.
@@zemoxian and I'm so glad the mechanical engineering school I go to explained in depth regarding both. And uh, as interesting as they are, they're some really annoying phenomenons when it comes to mechanical systems
The cancer treatment is called HIFU
HIGH INTENSITY FOCUSED ULTRASOUND
I've worked on it and I know how it works, yet it blows my mind.
I wanted HIFU instead of gamma radiation, but it was not approved in the US yet.
Awesome! Care to explain how it targets specific tissues in a little more detail? I have to admit that when she explained it in the video I scoffed a little because it sounds like such a non-specific and violent way to treat cancer.
TIL indeed
@@cheesecakelasagna ye
I have never heard it before, however it sounds like it involves interference to reach desired frequency at targeted point.
Since I found this channel all I have been doing the whole time is binge watching it. Ahhh its ASMR!!!
Found this channel a week or so ago … I try to watch a video every night before bed. This channel is awesome! Great work!
Love it whenever Euler is mentioned. Such an important mind in the engineering sciences: cavitation (as here), and (for structural engineering) Euler-Bernoulli beam theory, and Euler buckling. ‘Literally’ what we stand on to reach ever greater heights in engineering; without him, we’d ‘buckle’ under the load; we might even ‘bend’ at any ‘moment’; I’ll stop now, before my ‘stability’ is questioned (that one was a bit of a stretch, I admit...)
Other than how it was described was a failure in the interfacial properties of water and solids - when it is actually due to the material properties of fluids and self-surfaces (the potential energy increases through the generation of potential new surfaces of different energies). So Euler got the gist of the displacement causing an inertial problem - but didn't understand the energetics of fluids or surfaces enough to explain what he thought.
“A lie can travel halfway around the world while the truth is putting on its shoes.”
― Mark Twain
A bit like that quote.
Not Mark Twain, as he died before the quote is attributed to him and it isn't in his literatute. It is possibly Johnathan Swift.
See Quote investigator dot com for details.
On that note, I'm surprised she didn't cover the cavitation-based cold fusion studies that were eventually debunked.
@let's talk about George Floyd's Toxic Masculinity but you can say, a lie that the right spot from the left are peripheral there for ''rare'', while the left, a lie is the main stuff that they have to deal with from the right, historically.
Ever heard about "The Tortoise and the Hare" story?
The truth might not spread as fast, but its shoes will eventually allow it to reach much much further
@let's talk about George Floyd's Toxic Masculinity Means so much less in an era where "lie" is equivalent to "anything I don't want to hear." Traditional conservatism doesn't really exist anymore in the US (at least not in the Republican party where everyone thinks it should be. The closest thing to traditional conservatives in the US these days is the so-called "establishment" Democrats.)
I saw the title and thumbnail of this video and thought: "Huh, maybe what I was told is not right at all."
Turns out, the video explained what I knew, but gave me a much better way to describe it, and a better understanding of it!
Not only that, it introduced sonoluminescence.
Man, had I entered physics instead of engineering, I might be even more all over that!
Remember, Spoegefugi, nothing says you can't study whatever you like on your own, even today.
Even me:
Being a 15yrold
Understood almost everything!!
Engineering that doesn't go deep into physics? Which field? Computer or software engineering?
@@revimfadli4666 True enough, most engineering fields go hard into physics, but most fields only go hard into a small field of physics. Arguably, so does physicists, but they still get a lot better understanding of all kinds of physics compared to engineers. But to answer your question: Electronics Engineering. I have a good amount of knowledge of physics when speaking of electricity, but very little knowledge when it comes to most things in this video. Especially sonoluminescence, since, as she mentions, it is a field where we don't know all that much.
As soon as you mentioned the propellers (we call them screws in the Navy), I immediately knew it was cavitation. I was a Machinist Mate that worked in nuclear power plants in the US Navy 30 years ago. One of the things we had to study was cavitation in centrifugal pumps. We use centrifugal pumps to feed sea water into the heat exchangers of the reactor plants. Any cavitation there was dangerous, so we had to constantly monitor the feed pumps for speed and pressure.
Cavitation is also a huge factor to deal with in pump design and can also happen in plumbing and on the shut off side of a valve - google cavitation in pipes and pumps and there's a whole world of applied engineering there! Thanks Physics Girl you rock!
5:53 I think that image shows the effects of cavitation on a centrifugal pump impeller over time.
Sonoluminescence is fascinating!
@frzstat ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action ,
1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) ,
2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created ,
3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets )
4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure .
And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state .
.... could that be right ? 🧐🇬🇧🤔🤓
As an interesting side note, cavitation is also the reason for the noise of the "popping" sound you get when you crack your knuckles - or when your back or neck "cracks" when you move it certain ways, or even when you put some joints under a particular load, eg ankles cracking when you stand up sometimes after kneeling or crouching for a while.
In these cases it's all about a specific, often sudden, pressure drop in the synovial (joint) fluid as the joint is partially tractioned (surfaces pulled apart). Unlike, as with propeller cavitation, the cracking/popping sound occurs as a gas bubble is formed - not as it collapses - and is the reason why a joint can't be re-"popped" for at least a few minutes. This is because the "pop" is the sudden release, or gasseation, of previously dissolved nitrogen from the fluid into a bubble rather than gasseation of the water molecules themselves. To "crack" the joint again it is necessary for the nitrogen to re-dissolve in the joint fluid and attempting too soon will not achieve the required sudden drop in pressure because the gas bubble will expand as you try.
BTW, this process is completely harmless and has no effect on the joint surfaces, in case you were worried! It categorically does NOT increase your odds of developing arthritis.
>and is the reason why a joint can't be re-"popped" for at least a few minutes
Uh... voca.ro/12vWmX7aFap (might have to crank the volume; maxed out the gain on my microphone but it's acting up with its volume levels so the vocaroo recording is quite low, or my headphones are acting up and messing up playback) - that's me cracking the knuckles of my left hand 3 times in quick succession by setting my finger tips against my upper palm then squeezing them together, if you imagine tightening a spiral forward & down (this is done just with the hand itself, not using one hand to crack the other). I can do that pretty much indefinitely with both hands, but it starts getting uncomfortable & painful after a few. Using one hand to press the upper finger down until the knuckle cracks only works every once in a while though, as described. I wonder what it is that's happening when I do the indefinite squeeze crack thing.
Most useful comment i have ever read!
References?
That's what I'm searching for months . Thanks
@Scientific Humanist yeah, it's far better explained, on many fronts, by tendons or ligaments being caught on something, then snapping back into place.
This was awesome, I've never heard of this and it's a seriously cool phenomenon. Thank you, Diana
I did know how this works but I've never seen good footage of it. The short section from 06:19 shows how this works absolutely perfectly. It's really clear how the fracture occurs just after the cavitation bubbles collapse.
On an unrelated note, my daughter (14) was telling me how much she had been enjoying her physics lessons since she went back to school. I think she would enjoy your videos so perhaps I shall have a physics girl for a daughter.
Just when you think Leonhard Euler couldn't be involved in yet ANOTHER prediction he comes up with this banger
Only thing I've ever known about this topic is, 'Captain we're cavitating!!' -- Hunt For Red October (1990)
Thanks for this.
Cavitation is also a huge source of noise...and a whole heap of techno-jargon to keep the nerds happy (though they don't know why)
@@AdelaideBen1 also the reason to the USA navy had a big advantage over Soviets. We could build quieter screws.
the bubbles are the souls of murdered water fairies.
And the sonoluminence explains the mysterious light that they see at the end of the tunnel.
@@davemwangi05 So sonoluminence is caused by oncoming trains. I need to publish right now. Probably win a Nobel.
@@blindleader42 This is about the spiritual world and near death experiences.
Hey guys if you like space videos then do visit my channel pls once it's an interesting channel about space pls ...🙏🙏
@@davemwangi05 Duuuuuuhh. It's an effing joke.
One of the most interesting experiments you’ve done, thanks Diana!
This genuinely blew my mind. I've seen cavitation in the Mantis Shrimp and behind boat propellers but to see it in slow motion with the bottle trick was absolutely amazing!
FFO Dianna. I ran into cavitation in a chemical manufacturing plant. We had a situation where a solvent was evaporating in a pump and causing cavitation. When they pulled out the impellor, though the mechanics were pulling my leg. The bronze impellor looked like it had been attacked by termites! It is the strangest thing to see and until you understand what is causing it, it can be a mind-blowing experience. Thank you again for your continuing effort to educate us.
Sonoluminescence...
sounds illuminating.
Perfect
I've just received a New Message of a science pun
Sounds abright.
@@davemwangi05 it is not a pun, he just translated
@@TheZenytram do you see two possible meanings in the statement? then it's a pun
I've been breaking bottles like this with my hands for a few years as part of my magic act, I always had a suspicion it wasn't exactly as it seemed, but this is pretty cool to learn, thanks.
Slam the bottle with you head and you can double cavitate.... please don't I was only joking
"tail-whip", "stunned fish", "nom". That gave me the giggles!
That propeller thing was a part of a welding class. Do not think I have much to add, but it is an important part of estimating how long stuff like that will last. Like the forces of those tiny bubbles was described to contain baffeling amounts of PSI, so much that it can not be combated by using the stongest metals known to man. I think this is the forces that makes waterjets so efficient to cut hard materials.
Love it! Seems like 99.99% of UA-cam videos are worthless. Diana and her videos make up the better 0.01% ❤️
WE MISS YOU DIANA‼😥😥😥 PLEASE GET WELL SOON ‼‼‼💝💝💝💝💝
I remember seeing a documentary years back about sonoluminescence. The researcher was creating flashes of light in a tank of water using just the right frequency of sound and showed the slow motion cavitation bubbles. My younger self was like "definitely going to be a source of cold fusion"!
Intelligence and the scientific method are so awesome. They can not only blow your mind but completely destroy the answers that are simple, neat and wrong.
One of your best videos and, seeing how good all your videos are, that’s saying something.
This stuff must be telecast on TV,
why only 1M subs?
Spread her channel everywhere so she can grow as a youtuber✌️
Mark Robert explained this 3 years ago.
But the physics girl though gave plenty of examples and explanations of the cavitation phenomenon 👌🏼
Oh, three years ago! Good for him! And for you! Maybe the best presenter gets the audience.... And regarding “3 years ago”.... I went to Karlstad Mekaniska Werkstad in Sweden 1974-ish and actually watched a large propeller with adjustable propeller blades running in a closed tube system filled with water which was circulated in the tube loop by giant pumps and it had a transparent section illuminated by a stroboscopic light synchronised with the propellers revs/minute so the motion was “freezed”. There you could see the influence of water speed, revs/minute and blade inclination on the cavitation phenomenon and where on the propeller blade it would occur. Karlstad Mekaniska Werkstad was founded in 1860 ..إبراهيم عبدالرحمن
@@tomfull6637 No one ever said that cavitation is a new discovered phenomenon. Besid your fancy story, we are talking about that exact event with the bottle and what is acctully happening in that EXACT CASE. and if you searsh in youtube u will actually find few vidoes actually mentionning this exact phenomenon even before Mark
Wait for David Blain's Ascension to catch up..... Gonna blow up faster than a ping pong ball in a vacuum tube. SOOOOO PROUD OF YOU DIANA!
TV is for dumbing down people
Physics Girl out here giving hot takes and leaving no prisoners.
Honey's the only one you didn't explain! You explained the others! That's the one i was curious about! lol
'You use cavitation to make honey flow better by using cavitation to make it flow better.'
Yea and she didn't give it a reference either. I've tried searching the comments sections but its sadly missing from there as well.
5:56 cavitation is also a problem for automobile water pumps with plastic blades. Eventually little pieces break off and get sent through the engine cooling system. As the water pump internals degrade so does the effectiveness for the pump to pump coolant.
Exceptional video. I have translated a number of documents involving cavitation and its undesirable effects, but I was unaware of the mechanics of this process. Plus, you know, science!
@Everything #English with KSL ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action ,
1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) ,
2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created ,
3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets )
4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure .
And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state .
.... could that be right ? 🧐🇬🇧🤔🤓
If you want to see more slow motion footage of this phenomenon, The Slow Mo Guys made a few videos on it almost 7 years ago. One was the bottle trick, and two other videos were about firing guns underwater with Destin from SmarterEveryDay.
@Afluka ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action ,
1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) ,
2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created ,
3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets )
4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure .
And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state .
.... could that be right ? 🧐🇬🇧🤔🤓
This was amazing. You talked about the light formed. I am curious if when particles are accelerated or excited enough do they then create a moment of wave? Becoming light for just a moment in time. Just a thought.
It's amazing what scientists and engineers can learn from their mistakes.
That's what engineering is. Also destroying stuff on purpose.
@@Trident_Euclid yup totally. And it's a lot of fun
Woah. That slow-mo footage at 6:19 is amazing! It captures almost perfectly what is happening.
I was going to explain how I was able to surmise what was happening from it...
And yea it's what you use to explain, of course. Really great footage.
9:55 is when you stole my heart, the frequency based cancer cures are my favorite medical technology being developed right now.
So in carbonated liquid the nucleation sites act as a buffer to diffuse the concentrated force of the collapsing cavitation?
yea i think the jist of it is; as the co2 bubbles are dissolved under pressure, when a cavity appears the co2 immediately begins diffusing into it, which in turn would dramatically reduce the force of the cavity collapsing
SublimeSparo Thank you for the reply. My understanding would be that the distributed nucleation sites are formed as a result of the force created at the time of collapse of cavitation and not time of formation. It seems that my understanding of your statement is that the CO2 begins to dissolve into the cavitation as it forms? If that were true wouldn’t it lead to larger volume of cavitation? Wouldn’t larger cavitation have a greater kinetic energy?
@@erikthompson404 I think what he is saying is that the reason cavitation is so damaging is because of super low pressures, which "pull" the liquid around at incredible speeds. If the gas diffuses into the bubbles before it collapses, the pressure inside it won't be as low, so the speed(and by extension, the energy) of the collapse will be lower.
I think of it as a fixed amount of energy in spread out over a larger volume therefore each Cavitation bubble being less energetic and diffusing the shockwave.
@@Sublimeoo No - I don't think diffusion of gas into the cavity is a prime factor - but rather the fact that numerous cavities are formed, thus modifying the pressure fields. The fact that the cavities form is very likely to be due to the concentration of nucleation sites (which are a function of the reduction of surface energetics of having a dissolved gas - ie gas "liquefied" under a higher pressure). The pressure drop induces gas to transition to gaseous form, thus creating nucleation points for cavitation. Diffusion of gas from fluid to cavity increases the pressure in cavity (reducing the relative pressure differential), thus seeking to reduce the overall effect of the cavitation and reducing the resultant collapse (so if anything diffusion would seek to reduce the impact of cavitation)
I’m just happy the thresher shark gets the attention it deserves
I watched Mark Rober's video in late 2016 on this same subject and this goes into greater detail by a mile... nice :D
I recently had to write up a guidance regarding Water Hammer/Fluid Hammer. This subject is very common in industries where pumps and steam is used. This explanation is right on. I wish i would have seen this when i was writing up the section.
I LOVE this Lady . She is so Cute , Enthusiastic and Knows her stuff or where to find out about stuff . A Great teacher .
I just can't stop thinking about avatar the last airbender and waterbenders using this information.
1:09 ..my science BS metre - lol
Two points, I first discovered the power of cavitation when attempting to mix the contents of a sealed glass bottle by forcefully smacking the lid with my hand instead of shaking it.
I'm now wondering if the noise associated with the concept of water hammer is not so much due to the force of the water against the valve but really cavitation in the pipe leading up to the valve.
This was a SUPER interesting video!! Thanks a lot Dianna!!
The smile, the passion, the knowledge, the band-aid, I love her
Oh! So that's what is happening to your submarine in Subnautica when your ship's vocal interface announces the word "Cavitating"
Many thanks for another fact filled video Diana [:=
Now I understand a thing that we did in our teenage years in our friend group. When we were drinking beer in glass bottles and someone was distracted someone took the bottle and give the distracted person I little *clonk on the top and the beer starts to foam
Clonking is the term we used for it. Never knew it was cavitation though.
Yeah I just realised this too! It explains why you can get such a ridiculous amount of bubbles out of a small clonk.
If you do it hard enough you do shatter the bottom of the bottle. I was quite astonished when that was done to my bottle. Also, quite sad because that was a waste of good beer.
mark rober did this with the backyard scientist
Very cool episode today, Diana! Thank you for so many good shows! You are one of my favorites on YT!!
Excellent job on Cavitation and what all it does you Covered areas that I have delt with often in my lifetime and did an Excellent Job Diana I am so happy that I have found you here!! I have missed watching you with my Grandchildren on PBS I love keeping young minds thinking about every aspect of our world and the Physics of this world we live upon and the UNIVERSE as well, your research is great on every topic!!! Keep up the Excellent work and I am still a admirer of your Works in explaining and exploring the information available...
I remember hearing this term first time in "Hunt for Red October" go watch the scene
Closely related, solving the cavitation problem is why the US Navy prefers you don't get a good look at the actual shape of propellers on submarines.
@@mikew1332 That problem is decades old. Subs of any nation have developed propellers that don't cavitate if used correctly. The Russians have since developed a torpedo that deliberately cavitates. Not its propeller, but the torpedo "Shkval". Try to find out what sunk their Kursk in 2000.
Crazy, Ivan :)
@dodorichard ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action ,
1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) ,
2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created ,
3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets )
4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure .
And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state .
.... could that be right ? 🧐🇬🇧🤔🤓
I was hoping you'd say something about mantis shrimp.
I know right! They literally stun their prey with cavitation bubbles which also sonoluminate! Simone Giertz is disappointed.
s3cr3tpassword why is she disappointed?
DrumLife she went to famous prop maker in New Zealand to have a full body mantis shrimp businessman costume made for her.
She has also appeared on physics girl.
s3cr3tpassword oh yeah how could I forget lol
Damn when you said "Blow your mind" you really meant it.
Cavitation is essential in phacoemulsification, a type of cataract surgery.
It is amazing how things can relate with some physics phenomenom. Like something responsible of a propeller destruction is what brings sight back to people.
I learned a lot from this video! I worked in a boat yard about 26 years ago and was told to install metal/alloy or aluminium sacrificial propeller savers on the rear of boats, when I asked what they did My boss said the piece or alloy would corrode quicker than the propeller this saving it before it’s next service. Not sure if it’s related but the pictures of the damaged propellers reminded me of that time. Fascinating stuff! 😊
This is a great video; so many interesting facts and it's really well done.
I'd like to know how in the world someone discovered this phenomenon with the bottle.
And I've watched many, many shark documentary shows on TV and have never seen the thresher shark with the whip tail until now. You'd think I'd have seen it on one of the shows.
I can safely say I knew enough on cavitation to hold a conversation, but this is a whole other level! It was very interesting and I learned a lot! Thank you!!
Follow up question: do you think cavitation also occurs in the brain in hardcore soccer headers?
@@donepearce Yeah, I don't think you play soccer, that's not exactly what happens during a header 🤣 but I do agree with your stance on boxers!
'micro-cavitation'? Well worth a look, I'd say
Hehe, Mark Rober and the Backyard Scientist made the same experiment in the backyard in shorts, while Diana is wearing safety googles, gloves, a cloak and she is doing it above a tank. Thanks Diana for showing an example! Safety first!
The two explanations are totally different. Mark says that it is the water coming back down that bursts the glass. I think Mark's is better because his would explain why carbonated water does not break the glass, as the nucleation caused by the tiny air bubbles for carbonated drinks would fill in the space when the bottle goes down, cushioning the glass and making the water go down slower. In Diana's explanation, the bubbles are weaker but there's no explanation.
She did explain it. The energy from the cavitation is dispersed into forming nucleation sites for CO2 bubbles to form. You can see it directly in the video.
@@thomasneal9291 The explanation that is missing is about the bubbles being weaker on the carbonated version.
@@billyjoethethird8436 well i think its definitely the created CO2 gas that fills the bubbles aka counteracts it. regarding water coming down. idk. her point was that its shockwaves.
This is a great example of why women live longer.
The cavitation in carbonated water causing nucleation sites is so cool. I love it when different cool physics things combine to make temporary shock mentos
I am soooo in love with your brain!!! Every single one of your videos is fascinating and just makes me want to learn more! Thank you!!
Hey Dianna!.. eagerly waiting for your next video!..❤️ Yaaaar 🤗
Love From India 🧡♥️
Take Care 💕
Oxygen likes bond to other oxygens. When molecules put in sudden excitement.
Could be the outer hydrogens on water molecule. Closing in around them
Cavitating is pretty captivating.
And confusing as heck to my spellcheck, it seems.
@Physics Girl ... regarding solo luminescence 4:15 .... I reckon there are 4 key stages after the burst or compression action ,
1 : cavitation process begins as i gaseous expanse void perhaps created by hydrogen gas ( and perhaps oxygen too ) ,
2 : The void begins to re-amalgamate or reconstitute back into water due to pressure created ,
3 : As the area of the void collapses on itself , there are 2 halves or semi circular air bubbles ready to crash into each other ( like 2 planets )
4 : When the 2 halves bubbles ( pockets of void ) collide ( i dont know exactly if before or after ) with each other , the water molecule/s that became hydrogen gas ( in that short moment in time ) eventually combusted ( ignited/flashed ) under immense pressure .
And as any researcher knows , hydrogen once used/burnt returns to a liquid/water state .
.... could that be right ? 🧐🇬🇧🤔🤓
8:43 maybe the big bang instantly created our "bubble" - galaxies like this.
I think everybody comes here to see Dianna's joke at the end but ends up watching the whole video.
**When you already watched this trick explained by Mark Rober and The Backyard Scientist**
I watch way too many Science videos
There is always more to add tho
@@0Arcoverde yep :D
might be the same subject, but a different take on it. Allows people to absorb the info, some might like watching her instead :) or some people will be able to understand her better than his take on the subject :) either or, great video about it and very informative
The part that she explains and shows why it doesn't work with carbonated beverages helped me understand the other party trick. Where you bonk somebodys drink and it al spills out of the top with force. I love that they all made a video on the topic and I learned from each of them something new.
@@gewoonik687 oh yeah, that one
‘Why head injuries could possibly be more traumatic than we ever knew”
Me, a girl with a traumatic brain injury: uhhhhh...yeah. TBIs are incredibly detrimental to life. I’ve changed completely since my brain injury. Haha.
Did you really get a brain injury or the quotation marks have been blown off?
Cool story bro. Uhhhh yeah haha
How did you change? If may I ask
It's great that she managed to film it and prove the mechanism is related to cavitation but I'd still like to see a CFD simulation of it because I think there might be more going on in this experiment related to presurre waves reflection at the bottom of the bottle and maybe even shock waves in the air-liquid interface.
"ships have SCREWS not propellers"
Nope boats have propellers and bow thrusters that are actually Impellers
hey :v
Flammable Maths whoa it's you :U. I thought u hated physicists haha
flammy! youre here too :o
Thanks!
A well informed science talk and suddenly at almost 7 minutes pressure is measured in pounds-per-square-inch.
I felt a great disturbance in the Force, as if millions of voices suddenly cried out in terror and were suddenly silenced.
I know all about cavitation but never heard about the light thing . That was a brilliant show girl !!!!!
You are absolutely delightful. I hated physics at school. Too bad you weren't my teacher 50 years ago! Brilliant stuff. So happy I chanced upon your vids!
I work in sterile processing in a hospital. We use "sonic cleaners" to do a final cleanse after manual cleaning. The sonic cleaners use cavitation generated by sound waves to clean nooks and crannies to small for us to clean effectively by hand.
This is one of my favorite videos. You did a great job of narrating and overall production of the video. Really well done.
Cavitation is also a thing in diesel engine cooling systems. The frequency of the power stroke essentially bathes the cooling jacket side of the cylinder in Cavitation bubbles. This eventually leads to erosion that eats all the way through the wall of the cylinder. To combat this, we use additives(DCA) to the coolant. The way I understood it, it changed the viscosity/ resonant frequency of the fluid. Thus, reducing the cavitation effect.
One of my recent research topics has been to study cavitation in plants and ultrasound emissions from plants. Diana if you want to make a short podcast/video about the topic, I would love to be a part of it.
I saw Mark Rober's video on this a couple months ago, but you introduced so much more knowledge on the topic! I didn't know any of that stuff about cavitation in boat propellers!
This is so ridiculously well researched! A lot of it went over my head, but definitely learned a lot nevertheless