Hello everyone. I recommend you watch this one full screen or on a computer so you can see the cracks more clearly. They look bloody tiny on a phone screen! - Gav
Glass should break at the speed of sound through glass. You can look up the speed of sound in glass and find values between 4 to 5 km/second. So why does the glass seem to break at 1/3rd that speed? Well after thinking it over I realized that just like seismic waves during an earthquake there are different types of waves traveling at different speeds! So which sound wave are we observing? The "P" or "primary compression wave" travels fastest at about 4-5km/s in rock like material (glass) and is what is generally used for "speed of sound" but that of course travels far faster than what we see here. The "S" or "secondary shear wave" has a typical speed around 60% of that of P-waves in any given material. Great! but this means the "S" wave velocity is still too fast and cant be the culprit.
So that leaves the 3rd type of seismic wave: "surface" or "Rayleigh waves". Rayleigh are a lot like the "wave" produced by taking a tight string and flicking it; making the string tighter makes the wave travel faster. Unfortunately this means that "Rayleigh velocity for a sheet of tempered glass" is not something I can easially look up so I will have to approximate using the equation: v=sqrt((N/m^2)/((kg/m^3)/m) We know that surface of tempered glass has 10,000 psi (~7000N/cm^2) of compression ( leaving the inside under tension). We also know that the density of glass is 2.5g/cm^3. Plugging this into and simplifying the equation I am left with: sqrt(7000N/.0025kg) = 1700m/s which is close to the velocity observed! Now this makes sense since the stress that ultimately caused the glass to break was similar to "flicking" the end of a tight rope. I predict that if you hit the edge of the glass with a hammer (or maybe bullet) so that the "p" wave is causing the glass to fail we should observe a much faster (4.5Km/s) glass breaking velocity.
Love the analysis in this video. Dans description of the curvature of the fractures by considering the pane as a section of larger circle is spot on. Not only is it mathematically/physically correct they, explain it in such a way most people can understand it
I think you are the right person to answer this question, is the speed that they calculated the speed of acoustic waves (namely the "speed of sound") through that specific material?
Gavin spent a good amount of money and i see why, being able to crop the image and get a better frames per second, very versatile camera. He has done it in other videos, or with another camera.
I think it’s partly because as they have been uploading for so long so technology has advanced so the cameras are much better so even for them they keep being really impressive.
@@DinnerForkTongue I can confirm that tempered "safety" glass is indeed much safer and less likely to cut, but it is still glass and can still cut if you're right next to it when it shatters. I came here to this video to see what is happening in slow-mo since two hours ago I suffered multiple lacerations from a dusty arcade cabinet glass panel that slipped through my fingers and shattered right next to my exposed, shorts-wearing legs. It was like a miniature grenade going off and blasting tiny shards of glass into me. Much smaller than the glass nuggets that made up the majority of the debris. Some of the cuts were fairly deep, as well. Not enough to need stitches, but yikes. Two of the cuts took tiny chunks out of me. Definitely would not recommend breaking any form of glass next to your bare legs.
@@emilio_448 You only use 'Mach' when you're talking about an object moving through a fluid, and since contrary to popular belief, glass is *NOT* a liquid, I assume you would want to calculate the speed of sound in the air. What exactly are you trying to do?
antknee420 at 6:05. make what you will of what he says. Personally, I think the earth is round but if you think the earth is flat, ok. As long as you’re not hurting anyone, do and think whatever you want.
Hahaha I like how you are talking about this video as if it's anything more than just a couple of chaps breaking glass to see what it looks like in slow motion and lazily trying to explain the science behind it all
Here's what I found: A Mach number is the ratio of an object's speed in a given medium to the speed of sound in that medium.Mach 1, then, is the speed of sound, around 761 mph at sea level on a standard day. The term is also used as a metaphor for high speeds more generally. (I thought that otherwise you won't believe me)
It's safety glass. You can tell by the way it breaks--no sharp shards of glass or needles; just small, more or less uniform sized pieces. Not likely to cut when it breaks.
Connor, the android sent by CyberLife yeah, you’re right. Even though safety glasses lessen the danger of you getting hurt by glass shards, it doesn’t completely eliminate the danger. One example is car windows. Most cars have these safety glasses. But people still suffer injuries from shards falling on their body parts.
Would be awesome, unfortunately macro + high speed require stupid amounts of light. I'm talking tens if not hundreds more light than the brightest noon sunlight. Would probably heat up any insect to the point of killing it in seconds. Check out Tesla500, he did a high speed macro shot of a phonograph needle, took him some serious light sources and melted some plastic. Cheers
5:40 Clarifications from an Aerospace Engineering student. Spaceships don't go at mach speeds because there is no air in space, so you cannot go supersonic. But velocities above Mach 5 exist, they are called hypersonic. So far the only thing that reaches those speeds are bodies returning from space during the descent, called reentry bodies, or atmospheric entry bodies.
When they explain the curved shockwave travelling through the glass and becoming flat, it's a cool demonstration of what happens with electromagnetic waves at far distances, for example with antennas. The wave starts out spherical, but in the far-field range it can be approximated by a plane wave because of this same phenomenon. Pretty cool!
You can also back it up by saying it goes mach 4 speed, which is too fast for the human eyes to see properly, now if the teacher says then it should make a sonic boom, say that it depends on the size of the item, a glass that size clearly makes a loud shatter, not making a sonic boom
The slow mo guys: now if we shrink our horizontal and vertical view we can increase our frame rate up to 481 500 frames a second PC gamer frantically scribling on a piece of scrap paper: IM LISTENING
If the earth really spins i want a video showing a helicoper hovering over a building in one position showing everything on the surface of the earth moving east.
Gav and Dan: Have an ultra high speed camera probably capable of shooting at speeds of over 50,000 fps, amazing technology at their fingertips. Also Gav and Dan: Glass is cool.
5:46 Questions: 1) Could the crack propagation have been altered by the thin coat of paint over the glass which lends it a bit of integrity? 2) The Mach number is a useful layman's yardstick but the speed of sound in glass must be different from the speed of sound in air, and you might have drawn attention to that fact. It would not be a surprise to learn that said speed of sound in glass is in fact equal to the crack propagation rate.
I'm not these guys, but here's my 2 cents. 1) It's still supersonic, by at least 4*. *Practically* instantaneous. 2) Yeah, material may alter the speed of sound. The material also alters light, but we still measure by it. It's not like we can make "glass mach" or "water mach" a unit of speed (except in America, where we measure in washing machines before using metric system.)
Here is something interesting, maybe: How fast can cracks move? This question is not only of significance to safety engineering but also to earthquake dynamics. There are three fundamental wave speeds in solids. In order of increasing magnitude, they are the Rayleigh wave speed, or the speed of sound on a solid surface, the shear (transverse) wave speed and the longitudinal wave speed. Existing theories of fracture have led many scientists to believe that the Rayleigh wave speed is the limiting speed of crack propagation. Is this really true? Glass breaks, rubber bursts-there are numerous ways how materials can fail under extreme conditions. However, many of the atomic mechanisms of materials failure still remain a mystery. Some materials harden when they are stretched, others soften under large deformation. This phenomenon is referred to as hyperelasticity. We study the dynamics of cracks using the world's most powerful computers, whereby the motion of every single atom in the material is calculated according to Newton's laws of motion. Combining theoretical considerations and large scale molecular dynamics simulations, we derived the conditions under which hyperelasticity governs dynamic fracture. We discovered that cracks can propagate supersonically when hyperelasticity, the elasticity at large strains, becomes dominant within a zone of high energy transport near the crack tip. This is important in understanding the dynamics of earthquakes or nucleation and propagation of cracks in aircrafts and space shuttles. The results are in clear contrast to classical theories in which the speed of elastic waves was considered the limiting speed of fracture, analogous to the speed of light in the theory of relativity (M.J. Buehler et al., Nature 426 , pp. 141-146 , 2003).
I hate when someone makes a video of something moving very fast "oh its 7000 feet per second" and leave it at that. I live in the USA and honestly 7000 feet per second has no meaning to me. Once you pass mach 1 all other measurements just become obscenely large numbers that you cant visualize where as the mach scale is easy to visualize "its going mach 4" its going 4 times faster then the speed of sound
..............as an avid firearm "guy" I feel the need to put this into some perspective for others. The velocity of a bullet fired from an M4 Carbine (used by the US military) is approximately 3,000 feet per second when that bullet comes out of the muzzle. When firing one at 100, or even 200 yards (people that are used to metric can think of them as meters...it is close enough for this example) the bullet impacts your target basically instantaneously from the perspective of the shooter. So.....I guess.....if you had a piece of glass 100 yards long...it would beat a 5.56 in a 100 yard foot race. That blows my stupid little mind. Holy shat. Furthermore...there are VERY few rifle rounds that even approach this speed. If you can get 4,000 feet per second out of a rifle, it is screaming fast. There MIGHT be a rifle that could keep up with this glass, but I don't know what it would be.
I'm really curious how people thinks that "Thank you" can be used as an offensive term. I liked the content in the video, found it really interesting and REALLY thanked the fact that they converted the measurement unit. (cause, you know, that doesn't usually happens). I like physics. I found it really cool how the breaking of the glass goes in a "wave" form as an energy. Calm down peeps. Peace.
@@douganderson7002 Yes? lol. I have no concept of miles per hour or feet in large amounts. Metres and kilometres allow me to directly compare the numbers to the knowledge I have e.g speed of cars distance of roads and trips. Of course someone's understanding suddenly increases with a different unit of measurement, literally no different than a different language if you never use the other measurements.
@@douganderson7002 Hey, I walked like 2 ὄργυια from here to my kitchen, I used a ancient greek unit of measurement but that doesn't change your understanding of this sentence at all right?
"Wot goes mach 4.2?Probably a spaceship" TL;DR: Yes, a spaceship. The SR71 Blackbird had a recorded top speed of 3.5, however it's true top speed is still classified. In an interview with a former pilot, he recalled one of his missions over I think Germany, (probably off on that one) having a total of three missiles fired at him, and top performance was in order. Tilting the throttle to the maximum, engaging full afterburners, the two engines on that monster outran all three without any problem. When the interviewer asked how fast the blackbird took them in that moment, the pilot wouldn't say, only that it easily pushed them to mach speeds they had never seen yet.
7:26 I just wanted a little nostalgia. I wanted none, *zero* reminders of the present day. But to be honest, I probably wouldn’t have minded one much. But this *specific* reminder, these specific colours, will be the death of me.
Hey guys, I hope you end up reading this as I have a quite relevant suggestion. As far as I know, a crack propagates through the material at the speed of sound in that material. I googled the speed of sound of glass before seeing the results (about 4500 m/s) and was surprised to see the crack was far slower. However you used laminated glass which uses a thermoplast to reinforce the glass. I also looked for those and the speeds of sound in various thermoplasts is in the ballpark 1000-2500 m/s. I expect the fact that it is laminated glass slows the crack. It would be really cool if you tried 'pure' glass as well and see if the crack is three times as fast as I expect. Otherwise cheers nice video!
I did the same thing. Good job researching the discrepancy. I'd also like to see this repeated on untreated glass. Also, apparently diamond has a much higher propagation speed. That would be fun to see. ;)
@@WaylonFlinn thanks, yes that would be really cool haha. But sadly I think even the slow mo guys won't be able to pull a 1 meter slab of diamond out of their pockets :p.
Jhonny inc. they haven’t been doing this that long have they? Only since like a year before Gavin joined rooster teeth did they start. That was what 2010?
The American X-15 was a hypersonic rocket-type aircraft. The thing reached up to 4532MPH or Mach 6+! Although the thing was pretty much a manned rocket, it's still pretty cool.
@@troyjohnson6023 I believe the unclassified speed is listed around mach 3.2, the only things that point to actual speed would be ATC second and third hand accounts and some reported quotes from pilots reaching 'numbers that were unusual' SR-71 / yf-12 / a-12 are 8n the Lockheed family and had their engines designed in the 1950s. No computer aided design, absolutely brilliant supersonic engineering borne of slide rules and genius (very competent teams as well).
Hello everyone. I recommend you watch this one full screen or on a computer so you can see the cracks more clearly. They look bloody tiny on a phone screen! - Gav
You can't tell me what to do!
Don’t tell me what to do
*Hello The Slow Mo Guys✔*
oh woawie
It worked fine on my phone idkw
Glass should break at the speed of sound through glass. You can look up the speed of sound in glass and find values between 4 to 5 km/second. So why does the glass seem to break at 1/3rd that speed? Well after thinking it over I realized that just like seismic waves during an earthquake there are different types of waves traveling at different speeds!
So which sound wave are we observing?
The "P" or "primary compression wave" travels fastest at about 4-5km/s in rock like material (glass) and is what is generally used for "speed of sound" but that of course travels far faster than what we see here.
The "S" or "secondary shear wave" has a typical speed around 60% of that of P-waves in any given material. Great! but this means the "S" wave velocity is still too fast and cant be the culprit.
So that leaves the 3rd type of seismic wave: "surface" or "Rayleigh waves". Rayleigh are a lot like the "wave" produced by taking a tight string and flicking it; making the string tighter makes the wave travel faster. Unfortunately this means that "Rayleigh velocity for a sheet of tempered glass" is not something I can easially look up so I will have to approximate using the equation: v=sqrt((N/m^2)/((kg/m^3)/m)
We know that surface of tempered glass has 10,000 psi (~7000N/cm^2) of compression ( leaving the inside under tension). We also know that the density of glass is 2.5g/cm^3. Plugging this into and simplifying the equation I am left with: sqrt(7000N/.0025kg) = 1700m/s which is close to the velocity observed!
Now this makes sense since the stress that ultimately caused the glass to break was similar to "flicking" the end of a tight rope. I predict that if you hit the edge of the glass with a hammer (or maybe bullet) so that the "p" wave is causing the glass to fail we should observe a much faster (4.5Km/s) glass breaking velocity.
Wow! I think this might be the longest comment you've made in a while.
Ah. much better explained than the first comment you made.
@@khubba10 Well It is a good way to push the comment up to the top.
@@theCodyReeder true story, amazing explanation
Cody'sLab Look at mister smart guy here! :p
So if the earth was made of glass, it would take roundabout four hours till it is completely shattered into pieces.
Thank you Michael very cool👌
2.4h if you would crack it at the surface! The crack goes THROUGH the sphere, not only by the surface!
@@drBVR That would be true, if the earth wouln't be hollow like a Christmas tree ball.
@@perschistence2651 Ah.. yes.. I had to google it, but you are right.. the earth is hollow!
At least Donald thinks so, so it must be right!?
@@drBVR Exactly, you see, the internet knows everything!
Love the analysis in this video. Dans description of the curvature of the fractures by considering the pane as a section of larger circle is spot on. Not only is it mathematically/physically correct they, explain it in such a way most people can understand it
Hello im responding fast!
GaeafBlaidde was a good example of us being able to immediately learn from the footage we took. Love it when that happens. - Gav
Yeah you're right. It's such a complicated process put in this less than a second video. It's just awsome!
indeed!
yeah that was really genius. They're two pretty smart blokes considering some of the ridiculous things they do on this channel
2:44 that flash of light was everything
You talk like a girl
@@yKuroKenshi stfu, you legit like rainbows
@@crypticgaming3849 wtf of course I like rainbows... Wdym????
@@yKuroKenshi ua-cam.com/video/HnZ4sOCU1ZY/v-deo.html
@@crypticgaming3849 what’s wrong with rainbows mate
Excellent analysis on the failure front.
I'd love to see you do more glass cracking, Destin! Possible collaboration with Gav & Dan? :D
Hi Destin! I was going to say, this video reminded me a lot of your Prince Rupert's drop video!
Hi Destin
We expect a video now with your detailed analysis ;)
I think you are the right person to answer this question, is the speed that they calculated the speed of acoustic waves (namely the "speed of sound") through that specific material?
8:08 I think it’s so cool that after all these years they are still mesmerized by what their cameras can do
Sponsorship is a helluva drug.
yup
@@timmoe3370 no
Edit: whoops I made him delete his link 😂😂
Gavin spent a good amount of money and i see why, being able to crop the image and get a better frames per second, very versatile camera.
He has done it in other videos, or with another camera.
I think it’s partly because as they have been uploading for so long so technology has advanced so the cameras are much better so even for them they keep being really impressive.
I don't think shorts were the best clothing option for shattering glass at extremely close range.
It's safety glass. Very unlikely to cut anything.
@@DinnerForkTongue I can confirm that tempered "safety" glass is indeed much safer and less likely to cut, but it is still glass and can still cut if you're right next to it when it shatters. I came here to this video to see what is happening in slow-mo since two hours ago I suffered multiple lacerations from a dusty arcade cabinet glass panel that slipped through my fingers and shattered right next to my exposed, shorts-wearing legs. It was like a miniature grenade going off and blasting tiny shards of glass into me. Much smaller than the glass nuggets that made up the majority of the debris. Some of the cuts were fairly deep, as well. Not enough to need stitches, but yikes. Two of the cuts took tiny chunks out of me. Definitely would not recommend breaking any form of glass next to your bare legs.
@@jenniferlynn3579 Wtf is that XD just write a whole book
@@jenniferlynn3579 omgsh that's insane!! Are you better now? 🌻 It must have taken ages to get all the glass out (?) :0
Glass can cut though pants
To this day it still takes me a minute to remember that Dan is holding the glass in the beginning.
And wears shorts
Dan: cracks tons of glass
Also Dan: wears shorts
Milenium lets all be honest with ourselves here.... we’re all just so proud of him that it’s not crocs with socks ( yet )
Short pants.
Its called shorts
shants
@@iP0STcomments ports
At 6:00 they debunked the "where's the curve" argument of flat earthers.
But Flat earthers still wont believe it. Science arguments for flat eathers is like garlic for a vampire
globe companies say the earth is round to sell more globes
science confirmed
@@AriGoldFishing9136 Ah I forgot about billion making globe industry right after NRA and oil
Fluff you one thousandth like
Wheres your evidence?
The speed measured here is actually the speed of sound in glass!
Yes, and it's very sad that authors didn't mention that. In fact it's common property of solid substances
WOA
A question, should i calculate Mach with the speed of sound in the glass or the speed of sound in the air at room temperature?
@@emilio_448 You only use 'Mach' when you're talking about an object moving through a fluid, and since contrary to popular belief, glass is *NOT* a liquid, I assume you would want to calculate the speed of sound in the air. What exactly are you trying to do?
That is wrong. The speed of sound in glass is between 4000 and 5000 m/s instead of the 1458 m/s that they measured.
Dan just accidently explained how the earth is round
Haha
? There is no factual repeatable proof of it being round, so what did he say?
antknee420 at 6:05.
make what you will of what he says. Personally, I think the earth is round but if you think the earth is flat, ok. As long as you’re not hurting anyone, do and think whatever you want.
@@antknee420 it response for just Catie finding the part, the line is like the horizon
face it
the earth is a banana
i cant be the only who didn’t notice the glass plane at the beginning of the video.
I thought it was so weird Dan had his hand out like that until he moved the glass. 🤭
I thought it was my phone that had cracked at first
It surprised me
Jose Ramirez that got me too
Nope, your not alone 😂
You should try to fire a bullet at the same time and then compare the speed of the bullet with the speed of the breaking glass ;)
Do this. Please!
It would probably be too difficult to coordinate
Glass would far outpace the bullet. Bullets don't travel at Mach 4.2
Most bullets would look slow compared to this speed
@@michaelitsyaboymb8300 Got that right!
0:59 when the tea and crumpets is on point
4:34 companies 0.001 seconds after pride month ends
FadeFA I was just about to comment that
It's a shame pride month exists at all.
@@montpc259 could you elaborate a bit more on that
@@necronomics1804 I think it's because companies don't really care. They just celebrate pride month to seem inclusive.
Mont PC preach brother
Might be one of the nicest videos, visually, ever made on UA-cam. The edits, cuts, little moments... Brilliant video.
Hahaha I like how you are talking about this video as if it's anything more than just a couple of chaps breaking glass to see what it looks like in slow motion and lazily trying to explain the science behind it all
And not even 10 minutes.
Thank you John, very cool!
Lol welcome to the SloMo Guys...
@@scatered1 Yet they still did an excellent job, and it got over four million, very well deserved, views. That is their magic, my friend.
Really cool to see phineas & ferb still doing cool stuff in the backyard after all these years.
hahaha, good one
LoL^^
"what goes Mach 4.2?!"
A manhole cover.
Too bad there wasn't a fast enough camera to measure that manhole covers speed more precisely...
The way he says Mach really annoys me
Here's what I found:
A Mach number is the ratio of an object's speed in a given medium to the speed of sound in that medium.Mach 1, then, is the speed of sound, around 761 mph at sea level on a standard day. The term is also used as a metaphor for high speeds more generally.
(I thought that otherwise you won't believe me)
@@mranonymous481 Yes
Only Half as Interesting viewers will get it
These never cease to amaze me!
Jesus Christ youre like the new justin y
captions at the start of the video and youll change your mind about sending them to heaven (im joking)
*_Dad?_*
*verified*
Jesus Christ thank you Jesus Christ! Very cool.
That intro was beautiful. I noticed Dan holding it but didn’t realize it was glass!
I thought my phone screen was cracked because I dropped it like 15 minutes ago. It actually scared me for 5 second
the intro is beautiful but so are my two girlfriends
I didn't notice at all! Tricky 😆
Just like to point out he’s breaking big pieces of glass in shorts
Tough guy... I bet he is also frying his bacon bare-breasted.
It's safety glass. You can tell by the way it breaks--no sharp shards of glass or needles; just small, more or less uniform sized pieces. Not likely to cut when it breaks.
Connor, the android sent by CyberLife yeah, you’re right. Even though safety glasses lessen the danger of you getting hurt by glass shards, it doesn’t completely eliminate the danger. One example is car windows. Most cars have these safety glasses. But people still suffer injuries from shards falling on their body parts.
A road of glass would finish "cracking" from New York to London in 1 hours and 2 minutes
Did you calculated that yourself?
I figured it out and it would break from London to Los Angeles in 1.8 hours.
Wow thats mad
Dang... I could watch one act of a Gilbert & Sullivan opera in the time it takes for that road of glass to crack, lol.
I’d love to see that
0:20 I didn't realize anything was there till they pointed it out. That's one clear piece of glass
Polish Filipino can you watch my new vlog and tell me if it’s good or
not
@Shambles1980TRealOne We didn't watch vlogs in 2001
Please don't advertise here
Watching this on my cracked phone
Savage
Wow, your screen refresh rate might be on mach 4.2 😂
Same 😂
Do you know how fast was that cracked?...🤔
Same
The only UA-camrs I can’t get mad at for taking forever to upload.
They're uploading in slow motion.
Because it’s quality
Domics?
What about vsauce
"I think it's time to get carried away." The basic principle of this channel.
"I'm gonna bung in a ton of shutter here. 45 degrees?"
- "Ooh, that's naughty! You never do that"
"Bloody naughty innit."
Love these guys.
I didn't/don't know what any of that means, but "bung" makes me chuckle a little.
2:10 The ice after Scrat places his acorn in the Ice Age movies
Lol
My confidence after seeing my grades...
@@rainbowangel5264 I felt this
I love that this channel made me actually enjoy learning and it’s just 2 dudes painting rainbows on things and breaking them (for science)
The different between science and messing around is writing (or recording) it down xD
I love that quote.
i love how this channel is just two blokes having some fun with a camera for our enjoyment lmao wholesome af keep it up boys
"Got a church window?" is one of my favorite lines ever on this channel
Jason Woodring am I the only one who's ever wanted to remove church windows and replace them with lgbt pride mosaics
@@luxdeitine4882 I really hope you are
@@Pao234_ fair enough
@@luxdeitine4882 bro you poor thing. #didn'tdeservethemean
I didnt notice the glass in the beginning lmao
Me neither 😂😀😝😛😜
Scrolled through the comments just to make sure I wasn’t the only one 😭
i did
ya i didnt see it at first.
i wish they would have used the glass that dosent crack like this
@@dogfart1237 r/iamverybadass
Not gonna lie, I didn’t even see the glass until they pointed it out
Same
fresheroaks same
Abelfatbutt same
Same
I went to the comments to check If I wasn't the only one
I didn’t even notice the glass until you pointed it out
6:04 I think that was the smartest thing I've ever heard Dan say in a video
Who else didn’t notice the glass pane Dan was holding until they mentioned it at 0:24?
I didn’t notice it but I did notice a whale noise at 3:00
Yep
I didnt even know it was there until I saw this comment
... that’s the joke
Me
me: "Should i google what that number is in meters?... nah.."
Gav: "And for the International audience"
me again: "nice."
General rule: 1 meter = 3.3 feet (so I just multiply by 3 in my head, and then add a bit for the remainder if I don't need exact figures)
Marking it in feet like a proper American. Gav is fully indoctrinated now.
pocketlint82 marking in feet like a proper inferior system user
@@pocketlint82 lol we use feet for a lot of things in the UK too measuring the height of a person for example
@@zombievac Why not multiply by 10 then divide by three? No guesswork then!
I've always wondered how fast glass cracked. Now I know. Thank you, Slow-mo Guys.
0:21 I did not notice that glass XD
RANDOMstuff animation I did not notice you watch this channel m8
Me too
0:33 I legit didn’t even know he was holding glass
same, i didnt even realise until they pointed it out
Same lol
I was on my phone so I didn't realized...
Same
Mobie Gaming I knew they were holding the glass.
Not as fast as my self esteem broke
Dont kermit suicide
Kermit sewer slide
kremit the frog ooooh edgy
Kermit skewer died.
How do you break something that was never there?
14.1 million subscribers, 14.1 million views.
The ultimate in efficiency
Not as fast as UA-cam rewind dislike rate
BOOM! Got em...
Erick Lorenzo lol
We don't have the tech to see something that fast yet
Lets go lol
400th like
So we can all agree you guys now have to make a giant round glass video.
i'd be down to see that
Yess!
Yes.
They better.
Yes they should
7:57
Gav: “it just looks like a software wipe”
Dan: “it just instantly turns to like lizard skin”
Yeah, we heard them say that.
I am rewatching this video after a while and still didn’t notice the glass
Same though, 10 months later. I've seen this like 20 times.
SlowMoGuys x HowToBasic collab when?
When HowToBasic becomes mentally stable
hello there
"How fast do eggs crack?"
I'd be afraid he'd just start throwing eggs at them xD
Kaskobi I’m a lanchpadder and I love your vids like if you are to
You guys should film macro shots of insects walking and there joints moving, like a ant or a centipede. I think that would look cool.
I love this idea.
Me too!
Bump
Would be awesome, unfortunately macro + high speed require stupid amounts of light. I'm talking tens if not hundreds more light than the brightest noon sunlight. Would probably heat up any insect to the point of killing it in seconds. Check out Tesla500, he did a high speed macro shot of a phonograph needle, took him some serious light sources and melted some plastic. Cheers
I did a slo motion of a snapping turtle bite
If i was your neighbor, i would build a deck so i could just watch you guys do your stuff. better than tv.
But no slow mo
@@mr.e2297 you build the deck to watch and then they invite you to see the slo mo and you slowly become the third member of the slo mo guys.
The famous wasp-filled ceiling fan! I love going back to the older videos and seeing stuff that Gav has mentioned on F**kface!
Trending in UK - congrats guys! A new subscriber here.
haha I came from trending too
m3 too
Love your videos 😃
@@stardust4001 Thank you! 😊
These thumbnails are so attractive
Haha for once
LYRINIZE - 8D Music GREAT CONTENT! Mind checking out the my channel and subscribing so you don’t miss some great content!? Thanks! 👏🏼🤙🏼
Ikr? The guy is pretty good looking
PIERCE FIT
Lol go away with your self advertising
"If you love it so much then why don't you marry it?"
Dan, you probably should have worn some pants for that...
Sean Hearrell That’s what I was thinking.
It's safety glass, so there aren't large razor sharp edges, but yeah.
You're lucky he wore goggles and gloves tbh.
and also a respiratory system with 1500 liter oxygene tanks and 2 bomb suits?
seriously...
And here i am thinking it’s a camo joke.
Dan, "How much can you see?"
Gav, "Bloody stupid, this is."
Me, "Is that an answer? Sure."
Lol who else didnt notice dan was even holding the glass???
If you didn’t say that I wouldn’t have of known 😂
They wouldent have said anything and i would say no there was no glass
5:40 Clarifications from an Aerospace Engineering student. Spaceships don't go at mach speeds because there is no air in space, so you cannot go supersonic. But velocities above Mach 5 exist, they are called hypersonic. So far the only thing that reaches those speeds are bodies returning from space during the descent, called reentry bodies, or atmospheric entry bodies.
@@arturofernandez4058 I think you commented on the wrong thread
I alwasy skip the first ten 20 or 30 secs of any video so i had ro go back to see it. And still didnt get it for a bit.
When they explain the curved shockwave travelling through the glass and becoming flat, it's a cool demonstration of what happens with electromagnetic waves at far distances, for example with antennas. The wave starts out spherical, but in the far-field range it can be approximated by a plane wave because of this same phenomenon. Pretty cool!
It's follows the inverse square law
I didn’t even notice the glass Dan was holding at the start of the video.
I literally didn't even see the glass in the intro until Dan grabbed it.
I didn’t realize he was holding glass in the intro...
Anton H me to
Neither did I
Me to
Same lol
Same... I feel stupid...
6:25 - At this moment all flat earthers' heads exploded when they heard it as their tiny brains can't comprehend it. Nice video btw
@Goda Skėrė delete your account.
@Goda Skėrė
It's too dangerous here. Your kind is frowned upon in this realm.
Meanwhile there's me: "How did all these squares make a circle?!"
what they still exist the flat earthers no way it's not 1800's century it's 2019 what C'mon really. or is that a joke please be a joke😊😂
Can you guys do candle wax drop on water really curious how they form in slow mo
5:25 So basically a Square glass that's 1km^2 wide would take under 1 second to fully shatter. Impressive
Teacher: give me one fast thing in the world
Me: a glass breaking
Teacher: how is that fast?
Me: trust me, it's very fast
Legendary Andru just say light.
Is light 'in the world'?
...hm...
You can also back it up by saying it goes mach 4 speed, which is too fast for the human eyes to see properly, now if the teacher says then it should make a sonic boom, say that it depends on the size of the item, a glass that size clearly makes a loud shatter, not making a sonic boom
@@thesandwich5321 ...yes
@@thesandwich5321 can you see things?
The slow mo guys: now if we shrink our horizontal and vertical view we can increase our frame rate up to 481 500 frames a second
PC gamer frantically scribling on a piece of scrap paper: IM LISTENING
y e s
The same gamer:what kind of alien graphics card have you bought and where can I get it
*laughs in 8k in just a couple months*
laugh in 144p 5fps
*laughs in 8K and 300 fps*
2:10 *snap* Mr. stark, I don’t feel so good
HAHAHHHAHAH NICE
Lel
Companies when June is over: 4:37
I honestly didn't see the glass at first
BRAH SAME
Hold up, he held glass?!
I love how Slo Mo Guys Gavin and Achievement Hunter Gavin are almost complete opposites, and yet cause equal amounts of broken glass.
But still the English nose
I want a video showing how fast two liquid droplets will join surface tension and become one drop. You could do them two different colors.
Pretty cool idea, although my intuition wants to say that at that level of precision, colored dyes might affect the surface tension! 🤔
They did it once
If the earth really spins i want a video showing a helicoper hovering over a building in one position showing everything on the surface of the earth moving east.
@@Robert-yf1kn that's not how reality works
@@Soken50 You dont understand reality then,research why the earth does not spin.
Gav and Dan: Have an ultra high speed camera probably capable of shooting at speeds of over 50,000 fps, amazing technology at their fingertips.
Also Gav and Dan: Glass is cool.
SCIENCE!
5:46 Questions: 1) Could the crack propagation have been altered by the thin coat of paint over the glass which lends it a bit of integrity? 2) The Mach number is a useful layman's yardstick but the speed of sound in glass must be different from the speed of sound in air, and you might have drawn attention to that fact. It would not be a surprise to learn that said speed of sound in glass is in fact equal to the crack propagation rate.
I'm not these guys, but here's my 2 cents.
1) It's still supersonic, by at least 4*. *Practically* instantaneous.
2) Yeah, material may alter the speed of sound. The material also alters light, but we still measure by it. It's not like we can make "glass mach" or "water mach" a unit of speed (except in America, where we measure in washing machines before using metric system.)
Here is something interesting, maybe:
How fast can cracks move? This question is not only of significance to safety engineering but also to earthquake dynamics.
There are three fundamental wave speeds in solids. In order of increasing magnitude, they are the Rayleigh wave speed, or the speed of sound on a solid surface, the shear (transverse) wave speed and the longitudinal wave speed. Existing theories of fracture have led many scientists to believe that the Rayleigh wave speed is the limiting speed of crack propagation.
Is this really true?
Glass breaks, rubber bursts-there are numerous ways how materials can fail under extreme conditions. However, many of the atomic mechanisms of materials failure still remain a mystery. Some materials harden when they are stretched, others soften under large deformation. This phenomenon is referred to as hyperelasticity. We study the dynamics of cracks using the world's most powerful computers, whereby the motion of every single atom in the material is calculated according to Newton's laws of motion.
Combining theoretical considerations and large scale molecular dynamics simulations, we derived the conditions under which hyperelasticity governs dynamic fracture. We discovered that cracks can propagate supersonically when hyperelasticity, the elasticity at large strains, becomes dominant within a zone of high energy transport near the crack tip. This is important in understanding the dynamics of earthquakes or nucleation and propagation of cracks in aircrafts and space shuttles. The results are in clear contrast to classical theories in which the speed of elastic waves was considered the limiting speed of fracture, analogous to the speed of light in the theory of relativity (M.J. Buehler et al., Nature 426 , pp. 141-146 , 2003).
Am I the only one who didn’t notice the glass Dan was holding at the start until they pointed it out? 😂😂😂
Philip Stephenson thats the joke
Windex!
I didnt either 😂
Thx for using global measurements!
Me
You see this lionel mesi
glide to globul
I hate when someone makes a video of something moving very fast "oh its 7000 feet per second" and leave it at that. I live in the USA and honestly 7000 feet per second has no meaning to me. Once you pass mach 1 all other measurements just become obscenely large numbers that you cant visualize where as the mach scale is easy to visualize "its going mach 4" its going 4 times faster then the speed of sound
The daft thing is, both of these guys are British and we use the metric system here.
The guys break glasses out loud.
Neighbours: Omg, that family must be having a messy divorce
..............as an avid firearm "guy" I feel the need to put this into some perspective for others. The velocity of a bullet fired from an M4 Carbine (used by the US military) is approximately 3,000 feet per second when that bullet comes out of the muzzle. When firing one at 100, or even 200 yards (people that are used to metric can think of them as meters...it is close enough for this example) the bullet impacts your target basically instantaneously from the perspective of the shooter. So.....I guess.....if you had a piece of glass 100 yards long...it would beat a 5.56 in a 100 yard foot race. That blows my stupid little mind. Holy shat.
Furthermore...there are VERY few rifle rounds that even approach this speed. If you can get 4,000 feet per second out of a rifle, it is screaming fast. There MIGHT be a rifle that could keep up with this glass, but I don't know what it would be.
a 40 grain round from a 22-250 is about 4100/4200 fps!
i think the .22 swift is a bit faster however ive never shot one. 😁
@@greggreg6975 5.56mm is a .22 projectile
[Some] railguns... USN in one test got a muzzle velocity of 8268 ft/s
@@greggreg6975 Yes, but not 4,700...that was the whole point of my comment
@@michaeltempsch5282 Yes, notice I was specifically referring to "rifles" as more people have contact with rifles than railguns.
''And for the international audience...'''
THANKS GOD
I was looking for this comment, was getting worried when they were talking about 'a foot'.
yeah lol
I'm really curious how people thinks that "Thank you" can be used as an offensive term. I liked the content in the video, found it really interesting and REALLY thanked the fact that they converted the measurement unit. (cause, you know, that doesn't usually happens). I like physics. I found it really cool how the breaking of the glass goes in a "wave" form as an energy. Calm down peeps. Peace.
@@douganderson7002 Yes? lol. I have no concept of miles per hour or feet in large amounts. Metres and kilometres allow me to directly compare the numbers to the knowledge I have e.g speed of cars distance of roads and trips. Of course someone's understanding suddenly increases with a different unit of measurement, literally no different than a different language if you never use the other measurements.
@@douganderson7002 Hey, I walked like 2 ὄργυια from here to my kitchen, I used a ancient greek unit of measurement but that doesn't change your understanding of this sentence at all right?
"Wot goes mach 4.2?Probably a spaceship"
TL;DR: Yes, a spaceship.
The SR71 Blackbird had a recorded top speed of 3.5, however it's true top speed is still classified. In an interview with a former pilot, he recalled one of his missions over I think Germany, (probably off on that one) having a total of three missiles fired at him, and top performance was in order. Tilting the throttle to the maximum, engaging full afterburners, the two engines on that monster outran all three without any problem. When the interviewer asked how fast the blackbird took them in that moment, the pilot wouldn't say, only that it easily pushed them to mach speeds they had never seen yet.
Or, you know, the speed of sound traveling through glass. ;)
NEEEEEEEEEEEERRRRRRRDDDD
@@kam2597 you're right :D
@@senilegoldsmith4112 :D
@@kam2597 😹
7:26
I just wanted a little nostalgia. I wanted none, *zero* reminders of the present day. But to be honest, I probably wouldn’t have minded one much. But this *specific* reminder, these specific colours, will be the death of me.
Them: What’s that fast?
My brain: glass
Bruuh😒
6:13 Very sharp observation!
Glass cracking: I'm fast AF boi
Slow mo guys: Hold my beer
HEwO
It should be,
*Wait... That's illegal*
Rafay Cheema: I’m fast AF boi
Me: That’s dead AF boi
come on, my name’s even boring
Yes
Slow mo guys: hold my camera
When I watched it, I never saw the glass at the beginning, but after its revealed, I can't stop noticing it.
Btw. How’s that 14 ft glass circle coming
They're currently making plans on raiding the town's church
Wijnand Wetsteijn ill help, my brothers pretty chill.
Ties de Jong well yes but actually no
Nitrokiller 99 I’m fat
Who else didn’t see the glass in front of his face at the beginning?
dmaninisweener me
lol me
#MeToo
Bad joke, sry
I literally went back and watched the whole beginning again to make sure there wasn't any clever editing. Nope, I'm just not very observant...
Meeee
6:12 Well there's your next idea for another Super Slow Show
Wolffang731 true
please not another one :/
That’d be really interesting but I don’t know how they would pull it off...
Loved this one guys, new to your channel and really have enjoyed all I have seen.
Still better than UA-cam Rewind
You mean way better than youtube rewind
why are you even comparing this to rewind
@@preachey ikr
@John DHill bro why?
Everything is better than UA-cam rewind, that is most disliked video.
not as fast as my bookworm adventures deluxe speedrun time
Beef Stew this is truth
We need a sequel to bookworm adventures
Why do I always see you dude,😂
the new justin y
Go bother dunkey again
I know I am not the only one who didn't see the glass 0:23
Güççî Bëê you are very right 👍
😂👍
I just noticed that😂
Everybody saw the glass
CRAZY JAY I didn’t
Remember when these guys used to perform their experiments in a backyard?
*_Not that fast compared to 2018 youtube rewind disliker growth_*
Lol good one
Accurate 2
Good one : )
can you record some magic tricks in slow motion ????
lol
Yes. That's a video worth the crew Gavin
That would be bad idea considering copyright in the magic industry and such
@@sweetegg I think they could enchant the Terms and Conditions
@@sweetegg I don't know magic is copyright, lol
It strikes me, that they filmed almost the speed of a railgun projectile in such a high resolution. Truly awesome !!!
Speed of glass cracking -- Mach 4.2
Speed of a railgun projectile -- Mach 7.41
This is addictive.
Hey guys, I hope you end up reading this as I have a quite relevant suggestion. As far as I know, a crack propagates through the material at the speed of sound in that material. I googled the speed of sound of glass before seeing the results (about 4500 m/s) and was surprised to see the crack was far slower. However you used laminated glass which uses a thermoplast to reinforce the glass. I also looked for those and the speeds of sound in various thermoplasts is in the ballpark 1000-2500 m/s. I expect the fact that it is laminated glass slows the crack. It would be really cool if you tried 'pure' glass as well and see if the crack is three times as fast as I expect. Otherwise cheers nice video!
I did the same thing. Good job researching the discrepancy. I'd also like to see this repeated on untreated glass.
Also, apparently diamond has a much higher propagation speed. That would be fun to see. ;)
@@WaylonFlinn thanks, yes that would be really cool haha. But sadly I think even the slow mo guys won't be able to pull a 1 meter slab of diamond out of their pockets :p.
Sorry folks, that glass is
TEMPERED, NOT LAMINATED! Lifelong hands-on glass guy.
I was a kid when Dan's robe was still decent. Now i'm an adult, and he's still using it😂👌🏻.
Jhonny inc. they haven’t been doing this that long have they? Only since like a year before Gavin joined rooster teeth did they start. That was what 2010?
@@craneoquill4835 well if he was thirteen back then, he could be twenty-one now, a.k.a. an adult
Sam van Deudekom good point, it’s so strange to think of that really. It doesn’t feel like they’ve been around that long.
The American X-15 was a hypersonic rocket-type aircraft. The thing reached up to 4532MPH or Mach 6+! Although the thing was pretty much a manned rocket, it's still pretty cool.
Why am I not shocked its American? :P
AlisaMaederGodN9gga good old ego
also the us military had a sr 71 blackbird hit i believe 8.0 mach at one point.
@@troyjohnson6023 I believe the unclassified speed is listed around mach 3.2, the only things that point to actual speed would be ATC second and third hand accounts and some reported quotes from pilots reaching 'numbers that were unusual' SR-71 / yf-12 / a-12 are 8n the Lockheed family and had their engines designed in the 1950s. No computer aided design, absolutely brilliant supersonic engineering borne of slide rules and genius (very competent teams as well).
AlisaMaederGodN9gga Because the United States likes to build crazy experimental aircraft.
Fresh comment for an old post.You guys are doin great things,SCIENCE and stuff MANG!