Amazing Effect When You Put a Whirlpool in a Vacuum Chamber
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- Опубліковано 2 жов 2024
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In this video we test what happens to a whirlpool when you put it in a vacuum chamber. I show you how a whirlpool forms and then I test if this would still work in a vacuum chamber the results are very interesting!
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As some have pointed out there is definitely more going on here than just air pressure. In fact you cannot talk about any fluid flow with only talking about pressure. You have to always talk about fluid velocity and pressure together. We do know there is the centrifugal effect of water being thrown out the sides and also down the middle. But the reason there is ever any flow at all is due to pressure differences. The ball is being dragged down by the water but it is also moving fast and so the atmosphere pushes it down as well. There is also rarified air and eater vapor that forms under the ball pushing it up (maybe). This is definitely a phenomenon that I have never seen before in any literature so if anyone has any resources are open to hear more about this.
But isn't pressure in a fluid inversely proportional to its velocity? Shouldn't there be more pressure in the centre, where the fluid is at its slowest?
A.k.a.: imho, the ball doesn't sink because there is less pressure in the centre rather than on the sides, although that could explain that anyway through a reduction in Archimede's force due to the lowered pressure
Also, I don't think atmospheric pressure has anything to do with it, because once it is underwater it can't affect it, but I haven't seen the full video yet. Might cancel the comment.
Edit: I was wrong, atmospheric pressure plays a role, but I still don't think it works like you said. When it's completely sunk there is no way for the air to push it down, since it doesn't make any contact with it.
Also if there isn't a hole in the ball, is there air pressure in the ball that stays the same and could that potentially lead to it rising as well?
@@Anankin12 have you learned physics? In what class are you?
I thought the ball would go down for the same reason your helium balloon goes in front of the car when you drive. eg the water is heavier than the ball and will move toward the wall faster than the ball who get pushed center. With less force pushing the ball upward the ball sink. As for the ball going up I agree with other comments about water vapor since your other videos shows that water boils at that pressure. For the same centropic reason the vapor is also pushed toward the center under the ball.
Alternative explanation: the "air pocket" at bottom (under vac) is actually boiling water.
Yeah thats what i was thinking.
Also, im intuitively thinking it is the water flow that submerges the ball.
I think you're right. The water boils and dissolved gasses come out of solution where the pressure is lowest in the center of the vortex.
Consider repeating this with very cold water and see if the lower vapor pressure makes a difference. Or measure the temperature after doing this experiment with warm water. The evaporation/boiling may have already chilled the water by the end of the experiment.
Or repeat it with a fluid that won't boil. (Something with a very low vapor pressure.) That's all I have for now.
@@davidaustin3272 All good thoughts! Have I met a fellow chemist?
I swear one of those droplets of water hit my face when he was blowing the straw, so weird...
Quantum Entanglement with The Action Lab perhaps! ;D
Yeah its the iPhone x38
Drāno drain cleaner, lol
That is usually an effect people get
Parallell space hole?
You would need to also do the test with starting the whirlpool after the vacuum reaches least pressure for this to cover all the bases.
The type of 'spinner' you used has a serious effect on this experiment. The agitator at the bottom, is in effect, a sort of centrifugal pump. Water is constantly being flung outward at the bottom, then forced up the walls of the container and flowing back in toward the center (all with considerable tangential flow as well). (this is why this type of 'mixer' is so often used, it circulates the fluid both tangentially around the container, but also radially outward, upward, and back down in the center)
This downflow in the exact center, IMHO, is what drags the ball below the surface. After all, when the ball is completely submerged, the air isn't acting on the ball at all. As others have pointed out, as the water spins around it also has centrifugal forces acting on it, so the surface of the water is always perpendicular to the combined centrifugal/ gravitational forces acting on it.
It would be very enlightening to use a different mechanism to 'spin' the water. For example, remove the agitator and spin the entire beaker. With all the water spinning at the same RPM, you would not set up the same internal flow pattern. The water at the bottom would not be 'pushed' outward to the walls of the beaker any more than any other water, so there should not be any 'vertical' circulation. Edit: Without this, I predict the water will form a parabola, but the ball will not be 'sucked/pushed' under the surface (much like you saw it under the high vacuum condition).
"spin the entire beaker... I predict the water will form a vortex in the middle" - it won't create a vortex funnel. It will form a concave parabolic surface. Like liquid mirror telescopes.
I trust u cuz have big words
@@col0342 would you care to elaborate that for me please?
I think your explanation with the centrifugal force makes more sense; isn't the pressure what causes the water flow not otherwise?
@@sangnguyentan1911 I believe he's referring to the shape the water surface would form if you spin the entire beaker as I suggested.
Near the very center, with centrifugal force very low and gravity, the shape of the surface would be nearly a flat plane. Only as the radius increases does the centrifugal force become significant and then the surface curves upward.
This is exactly how a mirror for a reflector telescope is started. The final shape has to be ground precisely, but the basic concave shape is formed by 'spinning' the glass while still molten.
Man you constantly come up with original and interesting experiments. Happy to say this is not some pop science channel. Your really teaching lots of people obscure and interesting science.
Waauw Action Lab. You invented a simpel physics-setup that causes discussion among physicists! I envy you! I have my doubts about your explanation, but I cannot come up with a better one (yet).
Drink everytime he says: "lower pressure."
I’d die from alcohol poisoning.
He really thinks low of his viewers with 100 rehashes in a video. “Lower pressure, ok guys you get it now? Lower pressurezzzz”
@@ParaSheld Who said that you have to drink alcohol?
And also what amount?
@@lukmly013 I think he thought drink drink
🍺
I drinked evrytim he said those words n im not drink yet bud this is terrible grinking dame.
ACTION LAB!!
ACTION LAB!!
ACTION LAB!!
Let the legend continue
Yo
@@TheActionLab how tall are you? 6Ft?
One of the first and hi
@@TheActionLab i think it was floating a bit because the air was getting pulled from the water so that force kept it up is what i think instead you should drop the Ball after a vacuum
very cool
This is the best video!!! I didn't expect that at all!!!! It made a full vortex even though there was an object there....
In the normal pressure part, is it really the pressure from the air that sinks the ball, or the fact that the moving water is moving faster below the ball than above ? Perhaps the high-pressure experiment will tell. In the low pressure experiment, the air vortex below is likely to be vacuum, and the ball seems to be just floating on the walls of the vortex. These are my hypotheses.
Agree. The velocity of the water below is faster than that above the ball, producing a downward force due to the pressure difference(in addition to the original pressure difference).
The ball is floating on the walls of the vortex.
Great video. Just a reminder, all these are described by Venturi, bernoulli, coriolis....
I think would be a good idea to leave some references for people who want to go deeper. Again, great video, thanks for sharing
action lab: your explanation isn't accurate. it's more to do with liquid flow than atmospheric pressure. also you are conveniently skipping the fact that at very low pressure the water is actually boiling at room temperature
Who loves The Action Lab even tho he clickbaited us a few times?
In which vedio did he clickbated ?????
@@peacefulexaulter2160 The video which he talks about Vanta black
Even his clickbaits are scientifically interesting.
@@Milkycookiez34 that is a few times for you?? a few?
What he never does is bait and switch.
Water boils in a vacuum so it wouldn’t work, and whirlpools generally have a down current, air doesn’t have that much pressure on the ball compared to the water.
I’m so glad this channel exists ♥️
Yayyyyy I got a heart from Action Lab 😄
The Action Lab
The Action Lab
The Action Lab
Is the best channel on UA-cam.
As has already been pointed out - Water boils under vacuum. The cooler the water is, the lower the atmospheric pressure needs to be to reach the boiling point. With a low enough pressure, tap water will boil at room temperature. Yes, that's a Fact!.
If you place the ball on still water and then pull a vacuum, the water will boil all around the ball like a pan of water on the stove, only the water will NOT be hot to the touch. As the air is evacuated from the chamber water will reach a point at which it boils. Right after this, the vacuum gauge will stabilize and stop dropping until all the water is gone, then it will drop to whatever level your pump is capable of pulling on your vacuum chamber.
In your experiment, the "air pocket" that formed under the ball while rotating the water is the water's gaseous state trying to reach the surface. This action creates a lifting force. The bubble formes in the middle of the vortex since this is the water's lowest pressure point.
Going a little off subject. Something else interesting about water is it has a "triple point". That is the temperature and pressure at which the three phases (gas, liquid, and solid) can coexist in thermodynamic equilibrium. Under the correct circumstances, water can turn directly from ice (a solid) to gas without first becoming a liquid.
You can see clearer when it's clear! Love it! Also I thought that was an egg until he said "ball"
You're the closest thing we have to a 2000's version of the late Professor Julius Sumner Miller.
You aptly demonstrated the Venturi effect which makes a carburetor work.
i disagree with you conclusion: the ball goes down because of the water flow.
when you reduce the pressure you boil the water and the tendency is the densest fluid go outward. this, then, creates a zone with water vapour instead of water, having less thrust downward.
think of the stirrer as a pump that sends water from the bottom back to the top and you will understand.
when the water vaporizes the pump starts to 'cavitate' and the total flow is reduced.
this only happened because the vortex widened at the bottom. with a taller vessel or wider ball or a fluid that wouldnt evaporate at this low pressure (some polimer maybe?) you wouldnt see this effect.
a test you can make to prove this is to fill the vessel to the brim with water and seal it. there is no air pressure and the ball will go down because of the 'convectional' water flow.
you could even make a hole in the top of the lid and vacuum it and as far as there is no significant amount of water evaporated to start forming a cone the ball will stay down.
I totally agree with what you are saying his whole experiment just doesn't completely make sense to my
Even I completely agree with you. For some reason I couldn't agree with the explanation even after showing a practical. I too think it's just the water flow and not the air pressure causing the ball raise
Agreed. Maybe he could try it without the ball? The shape of the dip did absolutely nothing until the water started to boil. Doesn't that need an explanation?
Or try it with a piece of polystyrene with plenty of holes drilled through, to let the steam escape.
and, watching again i noticed another point: the 'air' beneath the ball is not air but water vapour that accumulated down there because the ball diverts the downward water flow from getting in the center of the spinner. bellow and above the ball where are gases (the 'inner cone') the pressure will be the same (a pressure low enough to evaporate water) . in the wet part of the ball are where the forces happens: buoyance and drag find equilibrium with that 'amount' of ball.
the cone does not form by air pressure. it forms by inertia of the fluid climbing up the walls by the "velocity/energy" imparted unto it by the impeller, centrifuge forces and all that.
by making the vessel closed at the top and filled to the brim you prove that: the water returns to the top and fills back the conical cavity without having the chance to climb.
to see the flow you could add some purpurin or other solid particles.
Rafael Ramos da Costa boiling is not an other process, The ball is locked. Maybe there is something more than pressure going on, but simply boiling will not do from my perspective.
2 questions, 1- what about the air exists in the ball 2- what about the gravity
By the way that was cool to see desolved air is not boiling much in movement
"When water moves it creates a low pressure. This is because when water moves it creates a low pressure. We know this because when water moves it creates a low pressure. The pressure is low because the water is moving. When the water is not moving the pressure is not low. Blowing on this straw double proves everything i just said. Blowing on this clear straw triple proves it."
question officially begged!
[ note to many: "begging the question" doesn't mean what you think it means ]
Perhaps the easiest to grasp explanation of what forces are actually at work there.
@@andriyshapovalov8886 -- Sounds more like calling out the circular argument.
@@willi-fg2dh wow. no one else is supposed to know begging the question is misused by almost everyone.
@@willi-fg2dh you are drunk 😵
I'm sure that someone probably mentioned this in the comments that I was too lazy to read. Water in a vacuum boils below room temperature.
Anyway, there are my two cents... I should probably check the upload date aswell but I couldn't be bothered with that.
Keep up the good work and have fun.
Great experiment! Overall air pressure has no direct effect on the ball - it pushes it down (via water) as much as it pushes it up. But the lower pressure allows building of steam- bubbles. They gather in the middle where the pressure is low and they build eventually a vapor column that wants to go up and pushes up the ball. It would be interesting to see the experiment with slightly warmer or colder water...
Better do it with some liquid with low vapor pressure, like mineral oil.
The impeller at the bottom eventually creates cavitation and a little bit of boiling occurs as well. Even though inside the box is almost complete vacuum, the water still creates pressure as you go deeper, but the pressure is lower now and cavitation occurs easily. However, this phenomenon makes the ball sink not rise. But the water around the ball still creates pressure and pushes it up.
When the pressure inside chamber is high I also think it causes the ball to go down to the low pressure created by swirl. Also the explanation using molecule motion and forces is equivalent to an explanation using fluid dynamics and pressure but the first one is at a more fundamental level. For example the flow of a liquid creates low pressure around it because the molecules near the edge are hit by the moving ones and the volume around is depleted of molecules so new molecules come to occupy the place and so on.
Got my subscription box yesterday !! Bit late but hey, I am sure there were good reasons. It had more than I thought it would. Quality hoses, brass fittings, thread tape for fittings, 2 wrenches, a vac gauge, patch,sticker, pin, instruction book and experiment book ,box with marshmallows -balloons - shaving cream. I like it all. Hope the next one is a bit more timely but I am sure you all were making a great effort. Maybe you got more orders than expected or ?? Thanks..
Yes this one had some hold ups. They should be timely from here every three months...glad you liked it!
Very good experiment but you should find a way to start the stirer after all the air is vacumed, because I think ball rises due to the dissolved gases under it can't escape and creates a pressure upwards.
_No swimming in the chamber orchestra_
(Does that even make sense?)
No lul
Yes. Do not swim in the chamber orchestra room because it requires the room to be filled with water and water is bad for wooden instruments.
Sarting at time mark 5:03 ; Upper vortex VS lower vortex,,, WOW!!!!! this video is great , Super.
Right idea for the wrong reason: at lower pressure , the gas/water vapor bubbling out of the water will tend to collect under the ball. If that didn't happen, buoyancy would keep the ball where it was.
Hmmm...I don’t think you can attribute all of the air under the ball to dissolved air. It is not trapped under there like a plug. But I agree that this could be part of the mechanism. There is a lot going on here, there is water dragging the ball down due to no-slip condition at the surface of the ball. There is air/water vapor below the ball as you said probably pushing it up. There is air pressure above pushing the ball down that mostly goes away under vacuum. This is definitely interesting though
This is my idea too. I thought he will start the spinner under vacuum.
I have a hard time believing the air pressure could fully submerge the ball. The water would have to be less dense than the air in the ball.
I think it's the water flow. The vacuum allows the water to rise higher on the outside. With more water on the outside and no water in the center, the toroidal flow forcing the ball down is greatly reduced. Not only is the flow reduced, the surface are of the water contact is greatly reduced.
@Henrik Wallin But why is the water going down in the middle?
@@TheActionLab what temperature was the water and what pressure did the vortex under the ball start forming?
I think the ping pong ball was sucked down into the center of the vortex because the vortex is basically acting like a centrifuge and the ping pong ball is less dense than the water so it is pulled into the center. The downward current of the water in the center then brings the ball to the bottom. If it was the atmosphere causing the ball the sink, the ball would only sink until it's top was just below the water's surface, after which, the atmosphere couldn't push on the ball anymore without moving more water out of the way first.
The reason the ball lifted up from the bottom when vacuum was applied, was because that where dissolved in the water (and possibly some water vapor itself) came out of solution. When these gases precipitated out of solution they became much less dense than the surrounding (still liquid) water and were pulled to the center of the vortex. In the center of the vortex where the centripetal influence of the vortex is negligible, the gas tried to rise up to the surface. But for the gases under the ball, the ball was in the way. Normally the gas would go around the ball but in this case they couldn't without being overpowered by the centripetal forces at the ball's edges that push them back to the center of the vortex underneath the ball.
Experiment starts at 4:15
ty
Thanks mvp!
The Action Lab is the Knoff Hoff Show for generation UA-cam
Great experiment! I think the explanation needs some work, though.
If it's just the air pressure pushing the ball down, then how does the ball "know" about the air pressure when it is already underwater? The only way the air pressure should be able to "communicate" downward through the water is by changing the pressure at the surface, which would only increase the total pressure at every point below globally. For the ball to be pushed downward all the way, there would have to be a gradient in pressure decreasing from top to bottom, a reverse of the gradient that would be there from gravity alone (when there's no vortex).
So I think Joël Séguin's hypothesis is more likely - that air resistance friction slows down the vortex at the top, and those layers of slowed-down spinning water slow down the lower layers a bit less, creating a gradient in speed from top to bottom enough to allow Bernoulli's principle to reverse the gradient in pressure that the water would have from gravity alone. The air pressure would then only provide the initial push down, with the friction-slowdown gradient pushing the rest of the way.
Well I showed in a previous video that the pressure propagated through the water so it doesn’t matter whether something is underwater or not it still feels the lower vacuum. For example if I had a balloon underwater in the vacuum chamber And I lowered the pressure of the balloon with still expand in fact that’s what I did in previous video. There is probably an affect due to the dissolved air or water vapor under the ball also
Yes, lowering the air pressure on top of the water should lower the pressure of the water below, but it should do so globally. Thus, a change in air pressure alone should not be enough to make the net force on the ball in this vortex experiment, when it is already underwater, change from upward to downward or vice-versa (i.e. the direction of the pressure gradient should stay the same). Pressure-wise, having air on top should only increase the pressure everywhere below just like having some extra water on top (with vacuum above).
And my guess would be that dissolved air should have a negligible effect in this vortex experiment (i.e. not qualitatively change the experiment's result).
@@davidellsworth4203 I agree with you. It's not the air pressure that is pushing the ball downwards underwater. It's the pressure gradient. The same kind of pressure gradient that keeps the ball in the centre.
Velocity of water will be higher near the bottom(as the strirer is at the bottom) than at the top surface of water. So pressure will be lower at the bottom. Same way velocity of water is high at the centre(so less pressure) and the ball tries to remain in the center.
I'm sorry but there is no way I'm going to read all the comments above mine right now.
Good job, dude! You're on your way to understand how gravity really works. This is "centrifugal gravity" =) The water doesn't "suck the ball down". The ball actually falls into low pressure zone. Now think the same thing but to centripetal process... Then you'll understand how planets "attract" each other. And how parallel conductors "attract" each other. When actually they are just being pushed towards one another. All this is just an Energy conservation law explained with Bernouli's equasion.
It would be so much fun to have this kind of dad. Never gets boring
This is the kind of video you have to watch multiple times just to meditate on how basic everyday physics works. I didn't quite understand a lot of things until now.
It's interesting, the different interactions between liquid (water) and air/vacuum, with gravity being a key ingredient. When you lowered the pressure in the chamber, you sucked out all the air, but not the water. Gravity was too strong to do that quickly anyway. However, you induced evaporation/boiling in the water due to the low chamber pressure AND the even lower pressure from the spinning in the center of the beaker. That's really interesting and it seems like some kind of mechanical computer could utilize these facts to make a sort of water-transistor or something.
Each of these videos is worthy of a 10th grade science assignment. I sourced and got inspiration for one of my assignments in the action lab video about heating up water by blending/stirring it. I conducted my own experiments and ended up getting full marks. Thanks for the effort and information put into these videos.
not sure if you meant that as praise or as an insult.
Lmao, I really thought you were roasting him.
Could be the right explaination for the unseen gravity
1:22 I thought it was his saliva
Hahaha..
Haha
I could’ve, but that’s why he showed the clear one
It would seem to me, having observed your video as the pocket of air began to form under the ball (Thanks to the water essentially boiling thanks to your lowering the pressure -- and thusly the boiling temp-- ) that in practicality what was happening was you made a sort of pocket atmosphere, thanks to the flow of the water which actually prevented the air from simply rising out of the water like it would as if you just let it boil, which was actually exerting pressure that was fighting gravity as it built up under the ball. So it seems to me that the ball didn't rise because there was no air pressure to push it down, but instead the dissolved air from the water simply began to push it the opposite way towards the lower pressure of the vacuum! Nonetheless that is quite a fascinating phenomena you made!
You're always able to explain what you're doing really easily and the subjects are fascinating. Thanks
one of your best yet
I always thought it was because of the centrifugal force of the water spinning it wants to move outwards and in doing so creates a hole in the middle
I think this is true as well.
I'm too
Could you build a reed switch or IR switch to control the stirrer so you can turn it on after vacuum is applied?
Also, maybe the air under the ball is due to the water being on the cusp of boiling. You could try very cold water vs warm water and see if the boiling point changes things.
Very interesting and cool.
@the action lab ball is floating in vacuum, but you have to consider one thing the air present in the ball also exerts some force
I think these conclusions are all mostly wrong and a little right. I think you will understand more if you dump a little glitter in the water.
It doesn't look like a game of pressure. From what I see with this experiment is that the volume of water level remained same whether the ball was inside or outside. It seems that extra empty volume created below the ball kept the ball up. Since the volume below the ball may not be air due to vacuum chamber, it means there is simply not enough space for ball to sink in the water. Also because the air is sucked out, the density of water should increase which should also contribute for ball to remain up in the water. Can we do this experiment with just the water(without air)? This is definitely centrifugal force which created low density area in the center of water but when we removed the air from water, the density was increased again and ball moved up.
1:46 This sounds like dentist's tools. I hare this sound
You misspelled hate
h a r e h a t e
The straw experiment ( like a draft in chimney) is like there is a static rest connection with a vertical column of air and a continuing column of water directly beneath the column of air .So that when a section of that column of air moves away from its rest position the connected column of water wishes to stay with that moving air it was associated with .The whirlpool experiment water is pretty much incompressable The ball then is being aided by a force that is pushing the water back so it can descend As in the vacuum this force stops it must be air There must be a very thin layer of air between the ball and the inside wall of the whirlpool holding back the resistance of the water pressure to let the Atmosphere push the ball down
5:23 Correction, that is probably not air, it's probably vaccum or possibly "steam" from the dissolved air in the water.
Rarified air/water vapor
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@@appmicro Ok? :D
@@TheActionLab It appeared right after you see bubbles of dissolved air into the water. These bubbles got trapped into the vortex motion under the ball, and caused the ball to raise up. I believe if this air or vapor has some way to escape from under the ball, the ball would sink again.
It would be interesting if you find a way to remote control the stirring motor, and start the vortex after all air removed - including that dissolved in the water, or just stop and re-start it under vacuum to check my interpretation.
love your explanation
15 views 27 likes 0 dislikes 17 comments
UA-cam is dizzy from the whirlpool
DinPlayz RBLX what 15 views 17 comments
How come a video have 15 views and 2 likes? HOW? and 17 comments even tho its still 15 views!
Tom Scott explains it very well in "Why Computers Can't Count Sometimes". ua-cam.com/video/RY_2gElt3SA/v-deo.html
Very neat, Action! 🍄
Can you start saying "Okay, this is epic"?
Quan Fifa yes
Please yesss
Libtards REKT with FACTS and SCIENCE!
Would a vortex be created if the machine was activated after its in vacuum and not before?
“Im gonna suck water by blowing air”
Starts spiting saliva
Fun stuff. People have problems thinking from the perspective of balancing forces since we are trained to think action, reaction... Party on.
Would you try to use a colored gas (should it not harm the mechanism of course) with the vacuum chamber so we can see the air leaving and entering the system? This particular experiment would be much better in my opinion
I barely know what’s happening but I still love this dude
Does the water in the straw rises up because blowing air above creates a low pressure, so the air in the straw goes out and rises the water up ? If yes, then why doesn't the air surrounding the straw replaces the blown air instead of the air inside the straw, just like the effect in the video of the table fan's back. I'd be glad if you'd answer. Not an entire video but just a reply would be more than enough.
PS. I still praise the day when I'd found 5his channel 😍. Just a few days to go to finish binge-watching all the videos of AL
uc_human If the idea is true, I think that they both do since there has to be some sort of equilibrium.
Instead of thinking about it like the air in the straw is leaving so it “sucks up” or pulls the water up, its more like the atmospheric pressure on top of the water in the beaker is pushing water down, causing water to go up the straw, like a mercury barometer. Normally pressure above the straw and above the beaker are the same, but when blowing air, the pressure above the straw is lower due to fluid air moving quickly (Bernoulli effect I think) so water is pushed up by the normal pressure air above the beaker
@@x4002 this sounds satisfactory. Thanks
You're blowing the air above the straw away, so it creates a low pressure zone. And water rises to fill it up. Like a burning candle in a jar placed in a bowl of water
I thought that it was osmosis and diffusion
I'd like to see what happens if you halt the vacuum and allow time for dissolved air to dissipate. Will we still get that formation below the ball?
Is it possible it was the water boiling that was raising the ball? The vortex would funnel the bubbles to the center.
interesting point of view there
zokyn well, he pulled a vacuum and I didn’t see it’s typical boiling effect so who knows.
This was the first thought that I had too.
It would be interesting to see this experiment done with a glass or clear plastic sphere done in a low to zero G environment. The ball should actually want to move to the middle center of the sphere. There should be a layer of gas bubbles that form around the outside of the ball.
that's also what I think
If I am thinking correctly in the vacuum the reason the ball was in the middle of the vortex was its size gravity was pulling it to the surface of the water which is now the walls of the vortex being tapered it only fit part way. Without the ball wouldn't the tapered vortex become a tube? And without gravity, the liquid would form a sphere and a vortex change sphere into a doughnut shape the ball would float above?
It is not about the air pushing down, it is all about the centrifugal force. Also, the water around the edge is moving faster than the water in the center.
Best vid so far today
Great video, thank you and have a good day.
The amount of air pumped out I wonder if the same amount added to atmospheric pressure in the sealed environment would do something. You would need a strong box with clamps to keep it closed. Basically you vacuum chamber beefed up to support high and low pressures
The vortex comes from the water spinning around the center and drifting out because of the gravity. The venturi effect (lifting up the water by pressure) comes from the air moving faster in small diameter and so losing pressure at bigger diameter. The reason this works is just because the density of the water is less and the vortex effect surface has less friction so it can spin faster inside and stabilize itself. So the vortex goes deeper. Simple physics.
I hit "Like" at about 25 seconds into the video.
Similarly, pressure and density differentials can make a boat sink simply by creating a certain amount of bubbles from underneath it.
Another way to explain it is that by vortexing you are displacing the water making a funnel hole through it. Now what is happening there are effectively two medium left, the ping pong ball and the air. Of course the ball is much more dense than the air inside the the vortex hole and therefore it will sink due gravity. It is really a boyancy effect of two distict matter medium. The whirlpool in that case acts just like a container and water boyancy is not a factor in this particular case.
However, at a strong air vacuum envirionment the boyant reaction force and momentum of the whirling water funnell inner surface in contact with the ball becomes a significant factor under the absence of atmospheric pressure from above and the ball is gradually pushed up. Also add in this case the diffused air current inside the water trying to come up and also pushing the ball up when applying the vacuum. Under that conditions I believe there is really no way the ping ball to be sucked inside the whirlpool unless the induced rotation becomes so fast that the vortex funnel widens so much that the ball literraly drops inside the void.
This the most amazing channel ever.
That’s interesting, I always thought the water coming up the straw by blowing over it, was the same reason that being to close to a fast moving train can pull you toward it, or being too close to a sinking ship can pull you down with it. I had no idea it was from the water pressure changing.
Water pressure does not change. Blowing across the top of the straw decreases AIR pressure in the top of the straw. Atmospheric pressure pressing on the water surface pushes water up the straw to the low pressure area.
@@elizabethbrown3135 right, creating a vacuum in the straw and sucking the water up. That’s what I figured was happening in the first place. Maybe I misunderstood what he said.
Great video as always
Re-do and add visual particles to water to illustrate the Velocity of the water's Radial and Axial re-circulation, going down in center and back up the sides, it should be substantial. Given that, I think more is going on here. The Friction between the ball and water Flow is greater than the Bouyancy of the ball. Initially, the ball reached equallibrium in the flow suspended under the water close to the impeller prior to Vacuum. Once Vacuum came close to being full, the water began to cavitate and/or Boil. This Cavitation caused an upwards flow of water vapor, up and around the ball like little ball bearings, reducing the Friction between the ball and the water's Velocity, increasing it's apparent Bounancy until it found equallibrium between the forces again, but still below the water surface. Thats my spin, how does this theory sound? I am not a scientist!
You may have created a near vacuum in most of the chamber, but presumably there was still nearly atmospheric pressure remaining trapped inside of the ping pong ball
By blowing on the straw and it sprays a mist out... that's basically how carburetors work. They are always supplying fuel no matter what. This is why its best to get as much swirling action from an intake when dealing with carbs. You want the air to mix the best it can with the fuel. Fuel injected engines swirl the air but mostly in cylinder. However, the fact that its a non-stop fueling with carbs is why they are less efficient than fuel injected which sprays just the right amount when needed.
The ball moving down is not because of air pressure, it’s because the spinner acts as a pump. A pump has a low pressure side and a high pressure side. The low pressure side is the center and the high pressure side is the outermost part of the container. Water is being drawn into the center and pumped up along the outsides. The spinner makes a vacuum at the center of the container that is stronger than the buoyancy of the ball. When you place a vacuum on the entire enclosure, the relative vacuum of the spinner becomes weaker than the buoyancy of the ping pong ball.
And no, the water isn’t boiling.
Is the ball solid? Or is it air filled? I wonder if a ball of equal buoyancy would end up in the middle of the vortex?
Added bonus: your stirring apparatus didn't melt! At first I assumed you'd have the base outside of the vacuum chamber, but given the thickness of the acrylic I guess it wouldn't be able to stir very well.
Would the ball being filled with air have a play in this experiment not being fully true to results since it would want to expand itself and go the action of just a giant bubble?
I wonder if keeping water moving in a vortex in vacuum will prevent it from freezing into ice?
If you are strapped on top off a falling platform falling from 1000 feet but at the last second you jump off will you have the force as if falling from the 1000 feet or from the point you jumped off at?
This was awesome, man!
Very interesting!
This might be off topic, but can you put Newton's cradle in a vacuum chamber and wait 10-20 years? And 20 yrs later, check if it is still moving, cuz' there is no air drag to slow it down.
you could do the same test without the ball you get a beautiful vortex of water vapor(?) or the vapor was there because of the ball?
how about the centripetal forces? surely the moving water particles closer to the edge of the container experience greater centrifugal forces and that has to be related somehow.
When are the subscription boxes arriving
Love your work brother! Liked and Subscribed! 😊
Does that mean than in a standing body of water in a vacuum chamber, the ball would sink?
2:22 You speak of _pressure_ as if water is compressable. It's not. And I seriously doubt the air that appears to "dip down into the water" does that because the "water pressure is lower than the air pressure". No. Centripetal force [or is it _centrifugal force_ -- I can never keep those strait!] is pushing the water up against the beaker walls, and the water in the center region dips down due to a lack of water. Also, the ping pong ball is merely swept down by the movement of the water as it swirls down in the center region. Near the beaker walls, the water swirls up, and the whole thing is a vortex.
So, I think you're way off, on this one.
Also, your blowing over the top of a straw only proves that moving _air_ has lower pressure than the surrounding air. This is true in a gas. But, it doesn't prove the case for a liquid, like water. At least as an explanation for what is going on in the beaker.
The reason why the ping pong ball rises in the vacuum, is because the weight of atmosphere is lifted from the water, removing the downward pressure vector, thus allowing more the the centripetal force to move more of the water to the sides of the beaker. This leaves less in the central region of the beaker, allowing a wider column of air to exist in the center, and the widness of the central column provides less downward drag on the ball, allowing it to float higher in the column [i.e. the bouyant force that works to lift the ball, becomes greater than the dragging force the works to pull the ball down].
Try this with a wider, or narrower beaker, and I think your result will be different.
There's still oxygen (air) inside of the White ball. I'm assuming it's not solid. So it's rising when there's no air pressure. You could be right tho cuz idk if the ball is solid or hollow with air inside .
i would like you to try it with high pressure would be very cool
i have a diff Q, doesnt water boil at lower pressure easily so how did you prevent that
Can you rig up something to turn the whirlpool on only after the chamber has been depressurized? I'd be curious to see if it still gets pulled down after.
The water would not expand significantly in a vacuum, but the ball, being filled with air and at least a little elastic, probably does, so the relative densities of the water and ball could also have some role here. A non-elastic or solid ball would eliminate that potential confounding factor.
Is the sound that is produce at some point when you blow on the straw the first harmonic or another harmonic?