How fast does glass crack? - The Slow Mo Guys

Gav and Dan use some absolutely insane frame rates to learn how fast 5 millimetre tempered glass cracks. 3 pieces of glass were harmed in the making of this video.
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Filmed at 28,500, 78,000 and 481,000fps on the Phantom V2512
How fast does glass crack? - The Slow Mo Guys

[@theslowmoguys]

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

[@GermaphobeMusic]

You can't tell me what to do!

[@littleike2228]

Don’t tell me what to do

[@mdmahmudulhasanmilu3159]

*Hello The Slow Mo Guys✔*

[@DMadHacks]

oh woawie

[@GigachadiusMaximusCaesar]

It worked fine on my phone idkw

[@perschistence2651]

So if the earth was made of glass, it would take roundabout four hours till it is completely shattered into pieces.

[@jablinskisgoat9504]

Thank you Michael very cool👌

[@drBVR]

2.4h if you would crack it at the surface! The crack goes THROUGH the sphere, not only by the surface!

[@perschistence2651]

@@drBVR That would be true, if the earth wouln't be hollow like a Christmas tree ball.

[@drBVR]

@@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!?

[@perschistence2651]

@@drBVR Exactly, you see, the internet knows everything!

[@theCodyReeder]

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.

[@SidewinderScience]

Wow! I think this might be the longest comment you've made in a while.

[@vacuumtube8933]

Ah. much better explained than the first comment you made.

[@theCodyReeder]

@@khubba10 Well It is a good way to push the comment up to the top.

[@devenirpyro]

@@theCodyReeder true story, amazing explanation

[@keithinadhd6693]

Cody'sLab Look at mister smart guy here! :p

[@ilian9420]

2:44 that flash of light was everything

[@yKuroKenshi]

You talk like a girl

[@crypticgaming3849]

@@yKuroKenshi stfu, you legit like rainbows

[@yKuroKenshi]

@@crypticgaming3849 wtf of course I like rainbows... Wdym????

[@pcd9230]

@@yKuroKenshi kzbin.info/www/bejne/fp-9ZaaFeLpkkLs

[@manmannihan5403]

@@crypticgaming3849 what’s wrong with rainbows mate

[@drowsiestvirus484]

Dan just accidently explained how the earth is round

[@orangegradient4309]

Haha

[@antknee420]

? There is no factual repeatable proof of it being round, so what did he say?

[@_itsjustcat]

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.

[@drowsiestvirus484]

@@antknee420 it response for just Catie finding the part, the line is like the horizon

[@qwe.2739]

face it the earth is a banana

[@fluffyou9276]

At 6:00 they debunked the "where's the curve" argument of flat earthers.

[@heyhuhh1366]

But Flat earthers still wont believe it. Science arguments for flat eathers is like garlic for a vampire

[@onmymommyweballin9136]

globe companies say the earth is round to sell more globes science confirmed

[@heyhuhh1366]

@@onmymommyweballin9136 Ah I forgot about billion making globe industry right after NRA and oil

[@e_c_t]

Fluff you one thousandth like

[@stevengleave9241]

Wheres your evidence?

[@20poundvoucher]

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

[@7f0g20]

Hello im responding fast!

[@theslowmoguys]

GaeafBlaidde was a good example of us being able to immediately learn from the footage we took. Love it when that happens. - Gav

[@HakanBacon]

Yeah you're right. It's such a complicated process put in this less than a second video. It's just awsome!

[@oswaldovzki]

indeed!

[@Cytrillex]

yeah that was really genius. They're two pretty smart blokes considering some of the ridiculous things they do on this channel

[@silent596]

To this day it still takes me a minute to remember that Dan is holding the glass in the beginning.

[@muserweaver]

And wears shorts

[@Xidphel]

"what goes Mach 4.2?!" A manhole cover.

[@al1rednam]

Too bad there wasn't a fast enough camera to measure that manhole covers speed more precisely...

[@namararenteria]

The way he says Mach really annoys me

[@mranonymous481]

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)

[@namararenteria]

@@mranonymous481 Yes

[@AManOnline.]

Only Half as Interesting viewers will get it

[@bingewatch8002]

I don't think shorts were the best clothing option for shattering glass at extremely close range.

[@DinnerForkTongue]

It's safety glass. Very unlikely to cut anything.

[@jenniferlynn3579]

@@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.

[@MothloolVA]

@@jenniferlynn3579 Wtf is that XD just write a whole book

[@bupi9372]

@@jenniferlynn3579 omgsh that's insane!! Are you better now? 🌻 It must have taken ages to get all the glass out (?) :0

[@yungcuben4137]

Glass can cut though pants

[@filip8689]

Dan: cracks tons of glass Also Dan: wears shorts

[@lolnjeoglondajmejejplejlis3365]

But he has shoes

[@Reblwitoutacause]

Milenium lets all be honest with ourselves here.... we’re all just so proud of him that it’s not crocs with socks ( yet )

[@digiorno5600]

Short pants.

[@uly_flexpoint1120]

Its called shorts

[@iP0STcomments]

shants

[@sajidahmed9732]

0:59 when the tea and crumpets is on point

[@josephyap3198]

A road of glass would finish "cracking" from New York to London in 1 hours and 2 minutes

[@mranonymous481]

Did you calculated that yourself?

[@mranonymous481]

I figured it out and it would break from London to Los Angeles in 1.8 hours.

[@datgaydangernoodle1315]

Wow thats mad

[@nnewt8445]

Dang... I could watch one act of a Gilbert & Sullivan opera in the time it takes for that road of glass to crack, lol.

[@PunchCounterpunch_Lizzy]

I’d love to see that

[@smartereveryday]

Excellent analysis on the failure front.

[@oscartigwell]

I'd love to see you do more glass cracking, Destin! Possible collaboration with Gav & Dan? :D

[@WeArePharmers]

Hi Destin! I was going to say, this video reminded me a lot of your Prince Rupert's drop video!

[@remi460]

Hi Destin

[@coreymeh8335]

We expect a video now with your detailed analysis ;)

[@luispuma25]

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?

[@itisinfactpaul2868]

The speed measured here is actually the speed of sound in glass!

[@aleksey4e]

Yes, and it's very sad that authors didn't mention that. In fact it's common property of solid substances

[@gryffindorgirl1009]

WOA

[@emilio_448]

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?

[@itisinfactpaul2868]

@@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?

[@Othmar98]

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.

[@1earflapping]

"I think it's time to get carried away." The basic principle of this channel.

[@cybersteel8]

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

[@eeliasish]

i cant be the only who didn’t notice the glass plane at the beginning of the video.

[@mishkadoll25]

I thought it was so weird Dan had his hand out like that until he moved the glass. 🤭

[@all-mightyloaf3192]

I thought it was my phone that had cracked at first

[@tylerquigley7687]

It surprised me

[@nicholasphillips4320]

Jose Ramirez that got me too

[@littleyellowbus4862]

Nope, your not alone 😂

[@spaghetti4896]

8:08 I think it’s so cool that after all these years they are still mesmerized by what their cameras can do

[@jonanderson5137]

Sponsorship is a helluva drug.

[@PrabhuRPR]

yup

[@dunno6442]

@@timmoe3370 no Edit: whoops I made him delete his link 😂😂

[@sofakingonmynuts1438]

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.

[@zimmermanjohn3797]

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.

[@kit2770]

I've always wondered how fast glass cracked. Now I know. Thank you, Slow-mo Guys.

[@JKonstanzer]

Loved this one guys, new to your channel and really have enjoyed all I have seen.

[@skimtvns8486]

Watching this on my cracked phone

[@adriancarreira243]

Savage

[@strema7750]

Wow, your screen refresh rate might be on mach 4.2 😂

[@ella-maisharp1679]

Same 😂

[@paul7787]

Do you know how fast was that cracked?...🤔

[@poisonivysaur4311]

Same

[@MrHesdan]

Really cool to see phineas & ferb still doing cool stuff in the backyard after all these years.

[@Tremor244]

hahaha, good one

[@beerenmusli8220]

LoL^^

[@frobey]

How fast does glass crack? 12M people: well well then, let’s find out

[@frobey]

Kpop Fan same person as what?

[@frobey]

Kpop Fan ohh..cuz someone else commented so i replied but he deleted that comment soo yea

[@chaeriyahyayah8920]

Now is 13M

[@tonov451]

why is that interesting

[@tuneboyz5634]

Yeah that's right

[@grimreaper1542]

Dan, "How much can you see?" Gav, "Bloody stupid, this is." Me, "Is that an answer? Sure."

[@xrox360]

2:10 The ice after Scrat places his acorn in the Ice Age movies

[@ostrichman-xq4pu]

Lol

[@rainbowangel5264]

My confidence after seeing my grades...

[@mallgoth]

@@rainbowangel5264 I felt this

[@genehunsinger3981]

Fresh comment for an old post.You guys are doin great things,SCIENCE and stuff MANG!

[@jonjon7311]

Excellent video. Excellent maths. Phenomenal speed. Well done, thanks 👍👍

[@liminal548]

4:34 companies 0.001 seconds after pride month ends

[@9hundredone415]

FadeFA I was just about to comment that

[@montpc259]

It's a shame pride month exists at all.

[@necronomics1804]

@@montpc259 could you elaborate a bit more on that

[@swampyswamperton6536]

@@necronomics1804 I think it's because companies don't really care. They just celebrate pride month to seem inclusive.

[@alexn9198]

Mont PC preach brother

[@PressTube]

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 ;)

[@Wissmann80]

Do this. Please!

[@awppenheimer]

It would probably be too difficult to coordinate

[@evanredacted7977]

Glass would far outpace the bullet. Bullets don't travel at Mach 4.2

[@michaelitsyaboymb8300]

Most bullets would look slow compared to this speed

[@borginator1493]

@@michaelitsyaboymb8300 Got that right!

[@yeetusmeetusfeetus1273]

I am rewatching this video after a while and still didn’t notice the glass

[@silent596]

Same though, 10 months later. I've seen this like 20 times.

[@Blue-oq9tq]

I love these guys so much

[@ashdamm9007]

That intro was beautiful. I noticed Dan holding it but didn’t realize it was glass!

[@triforce228]

I thought my phone screen was cracked because I dropped it like 15 minutes ago. It actually scared me for 5 second

[@AxxLAfriku]

the intro is beautiful but so are my two girlfriends

[@mynameistaken99]

I didn't notice at all! Tricky 😆

[@daylenkyles626]

The only KZbinrs I can’t get mad at for taking forever to upload.

[@teamcyeborg]

They're uploading in slow motion.

[@Tiernan422]

Because it’s quality

[@itsafkinjamina9377]

Domics?

[@aaronjou2220]

What about vsauce

[@hydrocat6218]

That was soooooo satisfying to watch the paint just,well,crack I guess

[@nolearystream]

The famous wasp-filled ceiling fan! I love going back to the older videos and seeing stuff that Gav has mentioned on F**kface!

[@vghnmj5523]

I didnt notice the glass in the beginning lmao

[@TheBestGrapefruitGuy]

Me neither 😂😀😝😛😜

[@ronaldburrelljr.226]

Scrolled through the comments just to make sure I wasn’t the only one 😭

[@dogfart1237]

i did

[@davidm4728]

ya i didnt see it at first. i wish they would have used the glass that dosent crack like this

[@incomprehension7571]

@@dogfart1237 r/iamverybadass

[@PP-bs3od]

"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.

[@xenorama7033]

I didn't/don't know what any of that means, but "bung" makes me chuckle a little.

[@spencerp4242]

I love how he isn’t scared of breaking the glass while wearing shorts

[@samueljoel6190]

one of the best channels

[@polish_filipino]

0:20 I didn't realize anything was there till they pointed it out. That's one clear piece of glass

[@Bradsmit]

Polish Filipino can you watch my new vlog and tell me if it’s good or not

[@jaymesyt]

@Shambles1980TRealOne We didn't watch vlogs in 2001

[@notmintmobile]

Please don't advertise here

[@steffenpetersen8314]

me: "Should i google what that number is in meters?... nah.." Gav: "And for the International audience" me again: "nice."

[@zombievac]

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)

[@pocketlint82]

Marking it in feet like a proper American. Gav is fully indoctrinated now.

[@cykachu8080]

pocketlint82 marking in feet like a proper inferior system user

[@dwobneb]

@@pocketlint82 lol we use feet for a lot of things in the UK too measuring the height of a person for example

[@TheMharr]

@@zombievac Why not multiply by 10 then divide by three? No guesswork then!

[@sardorbek6399]

The guys break glasses out loud. Neighbours: Omg, that family must be having a messy divorce

[@lwally7148]

1:54 that sound though...

[@troyjackson3400]

Not gonna lie, I didn’t even see the glass until they pointed it out

[@panickedhispanic5933]

Same

[@abelfatbutt9565]

fresheroaks same

[@darthnihilus3932]

Abelfatbutt same

[@pansquakes]

Same

[@magnummccormack8968]

I went to the comments to check If I wasn't the only one

[@Lickwetcarrion]

Might be one of the nicest videos, visually, ever made on KZbin. The edits, cuts, little moments... Brilliant video.

[@scatered1]

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

[@danielkuf2593]

And not even 10 minutes.

[@SovietMemes]

Thank you John, very cool!

[@guyfriedman295]

Lol welcome to the SloMo Guys...

[@Lickwetcarrion]

@@scatered1 Yet they still did an excellent job, and it got over four million, very well deserved, views. That is their magic, my friend.

[@BuddyPlot]

5:25 So basically a Square glass that's 1km^2 wide would take under 1 second to fully shatter. Impressive

[@kamrynsmart9151]

When I watched it, I never saw the glass at the beginning, but after its revealed, I can't stop noticing it.

[@madssrensen9673]

Just like to point out he’s breaking big pieces of glass in shorts

[@user-rp1jr2qo1k]

Tough guy... I bet he is also frying his bacon bare-breasted.

[@kenhaley4]

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.

[@connortheandroidsentbycybe7740]

@@kenhaley4 cool, still wouldn't gonna risk it

[@dfsseewsfewfg3511]

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.

[@michaelh.9686]

Who else didn’t notice the glass pane Dan was holding until they mentioned it at 0:24?

[@notnotfake226]

I didn’t notice it but I did notice a whale noise at 3:00

[@BoxFwog]

Yep

[@lemonnoob5333]

I didnt even know it was there until I saw this comment

[@DOSTalks]

... that’s the joke

[@therake9599]

Me

[@rjpittman4510]

Awesome. It's amazing how fast it goes

[@kappn4748]

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.

[@DinnerForkTongue]

SCIENCE!

[@xMaverickFPS]

it's a circle because it's literally just a "sound" wave moving through the glass. the speed at which it breaks is the speed of sound through that material. typically at ~345m/s through air at sea level, the speed of sound is magnitudes faster through solid objects. (audio engineering is a hobby of mine - i obsess over this stuff) amazing video. i loved every second.

[@bboyfan22]

This was the comment I was looking for. I was hoping they would talk about this during the video

[@zevolaful]

I know that you commented this two months ago but I'm super curious about it and I'm having a hard time finding answers via google that I'm able to understand as they're all very jargon heavy and I'm not really educated about this at all. What takes the physical force exuded by the pliers and transforms it into a "sound" wave? Is this the only way force is transferred through things? Does the speed of the force applied affect the rate at which the break forms despite the speed of sound being a constant? (For instance if Dan would have used a hammer and bashed the edge of it instead of crunching into it with the pliers) If you don't have time to answer would you perhaps have a link to something I could use to learn about it myself? Very much appreciated either way.

[@bboyfan22]

@@zevolaful the reason it travels at the speed of sound is because that's how long it takes one molecule to bump into another molecule. Each molecule can only "inform" the one next to it that it's "time to move" after it bumps into that molecule. Think of it like a line of dominos, that last Domino will feel the push but only after the *wave* makes it way through all the other dominos first. That "wave" of energy propagates at the speed of sound because that how fast vibrations can travel through that particular object

[@xMaverickFPS]

@@bboyfan22 you said it better than i could have.

[@zevolaful]

@@bboyfan22 OH! Thank you, that makes so much sense! Since sound is just a vibration of air particles it's essentially all the speed of 'vibration' but "speed of sound" is more understandable and useful. I really appreciate you taking time to explain that to me, thank you very much. I hope you and yours are safe and healthy.

[@mobiegaming4240]

0:33 I legit didn’t even know he was holding glass

[@cody-wf6zp]

same, i didnt even realise until they pointed it out

[@sagemadara1265]

Same lol

[@Summon_Ls]

I was on my phone so I didn't realized...

[@silent3956]

Same

[@GANGST]

Mobie Gaming I knew they were holding the glass.

[@waitselljones8068]

14.1 million subscribers, 14.1 million views. The ultimate in efficiency

[@glasstransport]

This is important. PLEASE READ. As a lifelong hands-on glass guy (cutter of up to 1" thick, custom flat glass of all kinds and very much more.) Please know the difference between laminated glass and tempered glass. What you have there is TEMPERED. Break a car windshield vs. side or rear window. Only the windshield is LAMINATED. That being said, this is GREAT!!! I have an old vid I slowed as much as I could (not much) and it was quite interesting. Three layers of glass laminated together, the center one being tempered. Installed it in a restaurant, then purposely broke the tempered piece. We call it Crackle Glass. The speed at which tempered glass breaks has always been something I wondered about. THANK YOU! I'd like to see you do pretty much the same experiment with all different thicknesses and compare the speed.

[@thejesuschrist]

These never cease to amaze me!

[@frederiklausing5071]

Jesus Christ youre like the new justin y

[@caidenmerritt1930]

captions at the start of the video and youll change your mind about sending them to heaven (im joking)

[@pmc614]

*_Dad?_*

[@demonwizard1]

*verified*

[@extrnalsorce4974]

Jesus Christ thank you Jesus Christ! Very cool.

[@GippyHappy]

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)

[@charredtodeath2205]

The different between science and messing around is writing (or recording) it down xD

[@Rachel-fi4sc]

I love that quote.

[@Ozloz]

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.

[@GrahameChristianGould]

Yep, really liked that. Very interesting. You got a like.

[@jasonwoodring4479]

"Got a church window?" is one of my favorite lines ever on this channel

[@luxdeitine4882]

Jason Woodring am I the only one who's ever wanted to remove church windows and replace them with lgbt pride mosaics

[@Pao234_]

@@luxdeitine4882 I really hope you are

[@luxdeitine4882]

@@Pao234_ fair enough

[@gamer-tn4yy]

@@luxdeitine4882 bro you poor thing. #didn'tdeservethemean

[@RANDOMstuffanimation]

0:21 I did not notice that glass XD

[@Skysiax]

RANDOMstuff animation I did not notice you watch this channel m8

[@Therealseegs]

Me too

[@huntsmanlazeralis4539]

I’d love to see you guys revisit this with the faster phantoms that are now available.

[@vandanamishra2908]

Hi, Dav & Gun ur all the creativity is awesum

[@ericklorenzo4772]

Not as fast as KZbin rewind dislike rate

[@joeshmoe12301230]

BOOM! Got em...

[@killerking8363]

Erick Lorenzo lol

[@goldengameA]

We don't have the tech to see something that fast yet

[@MoreAvier]

Lets go lol

[@HiloYT]

400th like

[@CreativoErratico]

So we can all agree you guys now have to make a giant round glass video.

[@Shearper2]

i'd be down to see that

[@roronoaz4lyfe1947]

Yess!

[@Nitram4392]

Yes.

[@LameMule]

They better.

[@projectaudeo]

Yes they should

[@ProLogic-dr9vv]

When you two put a video on you tube there is no point in there being a thumbs down button because all of your videos are great!

[@demetriusthers1186]

The circle theory makes so much sense therefore showing how genius u guys r

[@ontheBrightsiide]

6:04 I think that was the smartest thing I've ever heard Dan say in a video

[@roromad9603]

If i was your neighbor, i would build a deck so i could just watch you guys do your stuff. better than tv.

[@mr.e2297]

But no slow mo

[@gildedbear5355]

@@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.

[@rysentertainingentertainme5847]

That was fantastic!

[@lewiskelly14]

You're getting a thumbs up from me for catering for your international audience

[@liamsassman5630]

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.

[@Sam-iu8nb]

I love this idea.

[@Emily-yz9zd]

Me too!

[@Yonatan24]

Bump

[@TheDanyschannel]

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

[@BensChannel-rn7ge]

I did a slo motion of a snapping turtle bite

[@aldozulfikar54]

*_Not that fast compared to 2018 youtube rewind disliker growth_*

[@guyfriedman295]

Lol good one

[@guyfriedman295]

Accurate 2

[@beerenmusli8220]

Good one : )

[@ClanImprobable]

Fantastic, one of your first videos I saw and endlessly enjoyable!

[@ankushanni2323]

"45°" "Ohh that's naughty u never do that!" "Bloody naughty innit" Best lines

[@kale6991]

7:57 Gav: “it just looks like a software wipe” Dan: “it just instantly turns to like lizard skin”

[@AndrewVelonis]

Yeah, we heard them say that.

[@SmellTheCheeeez]

Dan, you probably should have worn some pants for that...

[@AmeerolisaRa-cw3qg]

Sean Hearrell That’s what I was thinking.

[@bloodytosser1]

It's safety glass, so there aren't large razor sharp edges, but yeah.

[@TheEthanEdge]

You're lucky he wore goggles and gloves tbh.

[@Sharpless2]

and also a respiratory system with 1500 liter oxygene tanks and 2 bomb suits? seriously...

[@photonicpiston9231]

And here i am thinking it’s a camo joke.

[@stuffyotter3542]

Love you guys

[@davidhenriksson285]

What a breakthrough!

[@LynxArcane]

''And for the international audience...''' THANKS GOD

[@tobihalo2]

I was looking for this comment, was getting worried when they were talking about 'a foot'.

[@maruftim]

yeah lol

[@LynxArcane]

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.

[@SirTatManTat]

@@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.

[@pedor5965]

@@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?

[@mizutani2144]

I didn’t realize he was holding glass in the intro...

[@lynahussein7450]

Anton H me to

[@AndreaRenwick]

Neither did I

[@abdelrahmanaziz5735]

Me to

[@TheCaptainJaes]

Same lol

[@TheToastOnFire]

Same... I feel stupid...

[@CorePathway]

Backyard Slo Mo guys was/is the best.

[@RGC_animation]

Objects tearing apart (glass breaking, balloon popping etc.) are some of the most interesting stuff to slow down, since somehow they go so incredibly fast.

[@stuartrobertson8211]

I honestly didn't see the glass at first

[@B0neyKingofN0where]

BRAH SAME

[@lukxd3225]

Hold up, he held glass?!

[@just-a-silly-goofy-guy]

Not as fast as my self esteem broke

[@manuelvelardez2466]

Dont kermit suicide

[@franciscomonterobravo7214]

Kermit sewer slide

[@mrpizzapi3867]

kremit the frog ooooh edgy

[@unicorn7337]

Kermit skewer died.

[@jortand]

How do you break something that was never there?

[@mikewarbin5776]

Amazing guys!!!!

[@michaelwilson2111]

Dude I did not see him holding the glass at the beginning hahaha😂

[@philipstephenson6118]

Am I the only one who didn’t notice the glass Dan was holding at the start until they pointed it out? 😂😂😂

[@tequilasunset6567]

Philip Stephenson thats the joke

[@teamcyeborg]

Windex!

[@gerardlulinda4252]

I didnt either 😂

[@Kaskobi]

SlowMoGuys x HowToBasic collab when?

[@jediael9906]

When HowToBasic becomes mentally stable

[@LilKat]

hello there

[@AvoxionYT]

"How fast do eggs crack?"

[@nova_vista]

I'd be afraid he'd just start throwing eggs at them xD

[@ashcook2975]

Kaskobi I’m a lanchpadder and I love your vids like if you are to

[@dustyk103]

That was AMAZING! Mach 4! 😵‍💫

[@myyoga8spa]

That was EPIC 😍

[@Holden_McHock]

Lol who else didnt notice dan was even holding the glass???

[@harleyss]

If you didn’t say that I wouldn’t have of known 😂

[@KODABARKS]

They wouldent have said anything and i would say no there was no glass

[@arturofernandez4058]

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.

[@jamesmnguyen]

@@arturofernandez4058 I think you commented on the wrong thread

[@jdrmurphy4141]

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.

[@n3lis94]

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!

[@WaylonFlinn]

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. ;)

[@n3lis94]

@@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.

[@glasstransport]

Sorry folks, that glass is TEMPERED, NOT LAMINATED! Lifelong hands-on glass guy.

[@gordonhaire9206]

This is addictive.

[@MaiChaMH]

Am so thankful that you give the speed in Mach

[@animalmother556x45]

..............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.

[@greggreg6975]

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. 😁

[@YouPlague]

@@greggreg6975 5.56mm is a .22 projectile

[@michaeltempsch5282]

[Some] railguns... USN in one test got a muzzle velocity of 8268 ft/s

[@animalmother556x45]

@@greggreg6975 Yes, but not 4,700...that was the whole point of my comment

[@animalmother556x45]

@@michaeltempsch5282 Yes, notice I was specifically referring to "rifles" as more people have contact with rifles than railguns.

[@nathanschmick9681]

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.

[@JordanYee]

Pretty cool idea, although my intuition wants to say that at that level of precision, colored dyes might affect the surface tension! 🤔

[@masterraceofeverything4504]

They did it once

[@Robert-yf1kn]

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.

[@Soken50]

@@Robert-yf1kn that's not how reality works

[@Robert-yf1kn]

@@Soken50 You dont understand reality then,research why the earth does not spin.

[@The_DynamiteX]

The slow mo guys: what goe’s faster than mach4.2 Me:light

[@luvie802]

They said physical things

[@squidwardo7074]

@@luvie802 light is physical

[@SylveonMujigae]

@@squidwardo7074No, light isn’t physical matter. It’s a form of energy; it’s radiation.

[@squidwardo7074]

@@SylveonMujigae never said anything about matter

[@bigbigblast]

Couple of questions: Is that speed true for all types of glass? Did the paint slow down the cracking in some way? Like a film that held the glass fragments together?

[@the_undead]

That speed likely wouldn't even be the same for the same types of glass. Because of the way glass is produced the actual molecular structure of it changes wildly from peace to peace so the speed at which a pressure wave can travel through it will again wildly vary relative to most other materials where it is a very predictable speed. You could probably find pieces of glassware the speed of that pressure wave is up to 50% faster or slower depending on many factors