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  • Hey it's me Destin

  • Welcome back to Smarter Every Day.

  • Have you ever been driving along

  • and you suddenly stop and realize that you're moving

  • around this world in a bubble of glass?

  • It's kind of weird if you think about it.

  • But it's really cool.

  • Engineers have designed the glass in your car

  • to be extremely safe, so that when you have a wreck

  • you decrease the chance that you're getting

  • cut in half like the bad guy in Ghost.

  • Remember the movie Ghost? Anyway.

  • So today on Smarter Every Day

  • I want to investigate the two different types of glass

  • that go into car windows.

  • On the side you have tempered glass,

  • kind of like a Prince Rupert's Drop, but flat.

  • And on the windshield you have annealed glass.

  • First let's talk about windshields.

  • Glass on a windshield is designed to take a hit from a rock and not fall in on your lap.

  • However, glass on the side windows are different.

  • To demonstrate that, I got a window out of a car in a junkyard

  • and we're gonna hit it and just watch what happens.

  • Check out how it breaks.

  • It doesn't break.

  • That's because it's designed to be very very strong in the center

  • but not on the edge.

  • Watch what happens if we do the same thing on the edge.

  • [shatters]

  • The whole thing shatters.

  • To understand exactly why this happens

  • we're gonna go to my driveway and use a high speed camera

  • to analyze this at 20,000 frames per second.

  • What are you doing Mr Helper?

  • - Holding glass.

  • - He's holding the glass. This is not tempered glass.

  • We've got a high speed camera, this is a V1610

  • which at the time that we made this video is the fastest

  • high speed camera on the market.

  • And I have another helper over here.

  • Not you.

  • What are you doing?

  • Pushing the button when the camera breaks..

  • I mean when the, um..

  • - The camera's not gonna break! [laughs]

  • - The glass.

  • - When the glass breaks, and what does that do?

  • - Start the camera.

  • - That's right. OK.

  • So what we're gonna do is we're gonna drop tempered glass

  • and not tempered glass,

  • and we're gonna show the difference between the two.

  • And there's a special announcement at the end of this.

  • So, let's do some science.

  • You can move buddy.

  • - I can move?

  • - I've got it. Yep, safety glasses on.

  • You ready little girl?

  • Ready?

  • 3.. 2.. 1..

  • [shatters]

  • [laughs] OK, did you do it?

  • [slowed shatter]

  • OK you ready buddy?

  • Tempered.

  • Are you ready?

  • Do your best.

  • 3..2..1..

  • Did you get it?

  • It didn't break.

  • The tempered glass didn't break.

  • Dropping from higher this time.

  • Try to drop it on the corner too.

  • 3.. 2.. 1..

  • Yahaa!

  • It's not breaking!

  • OK so it wasn't breaking so we're gonna tape this wrench onto the bottom

  • of the glass.

  • And the idea is that maybe the wrench will actually twist the edge

  • and break the glass when it impacts.

  • We'll see.

  • Hopefully it works.

  • 3.. 2.. 1..

  • [smashes]

  • There we go.

  • [slowed smash]

  • OK this is the aftermath.

  • You can see on the left we have tempered glass.

  • On the right, that's just normal annealed glass

  • so the question is, why do they break differently?

  • It's pretty awesome though isn't it.

  • OK so what did we learn from this experiment?

  • Annealed glass is just normal glass that's been

  • heated up in the manufacturing process and then allowed to cool down gradually.

  • This cooling relieves any internal stresses on the glass.

  • You'll notice when the annealed glass breaks,

  • not only is the cracking slow but sometimes it doesn't even make it to the other side of the glass.

  • Which is good for windshields.

  • A small crack in one spot of the windshield doesn't completely blind your vision.

  • Also they put a piece of plastic between two sheets of annealed glass

  • so that these big shards don't fall in and cut you inside the car.

  • Tempered glass is very different.

  • Instead of allowing the glass to cool down slowly

  • they use forced air to cool down the outer sides of the glass really quickly

  • which leaves the inside of the glass hot.

  • Kind of like how a Prince Rupert's Drop is made if you remember that video.

  • The inside is still hot so as it cools down

  • it shrinks and pulls in which puts the outside of the glass in compression

  • but the inside in really high tension.

  • Just like the Prince Rupert's Drop if you can get through that hard outer layer

  • it releases the tension and the feathering front destroys the entire sheet of glass.

  • On the Prince Rupert's Drop you have to get through the outside curved surface

  • of the drop to release the tension.

  • But on a car window you have to get through the flat tempered surface to release the tension.

  • With a sheet of glass though, we have to start it along one of the edges.

  • Even after you break tempered glass

  • you can sometimes still hear the stress releasing itself as it continues to break.

  • So there you go.

  • The next time you need to escape from a car window

  • remember that the windshield is annealed

  • and it's gonna hold together

  • but the side windows are tempered and they're gonna bust out

  • completely as long as you hit them on the edge.

  • OK I'm just gonna go for this.

  • You're smart, you know how YouTube works.

  • A company approaches a person with a large channel

  • and says can we sponsor a product on your channel

  • and the guy says yes, and they agree on a price.

  • This is different.

  • I actually contacted this company

  • because their product has changed my family

  • in a really good way and I want that to happen to your family.

  • It's called Kiwi Crate.

  • Last christmas I wanted to get a gift for my kids that would help

  • me spend more time with them.

  • Right now I've been living in hotels for two and a half weeks,

  • I want to spend time with my kids right now.

  • Every month a Kiwi Crate shows up at the house for each of the kids.

  • My son has a tinker crate, which is like a science and engineering kit.

  • This is a trebuchet he gets to build, laser cut plywood.

  • This is my daughter's. It's called a doodle crate.

  • She gets to do an art project every month.

  • She made paper. We did it together.

  • My youngest son gets another one.

  • This one's on transportation.

  • This is called a koala crate.

  • It's a little thing for his age group.

  • But every month they each get a box and they know

  • that this box is something they get to do with daddy.

  • So, I really want you to do this.

  • If you know a kid and you want that kid to

  • you know, just have their mind stimulated

  • in many different ways.

  • Please consider going to kiwicrate.com/smarter

  • Get a subscription for that kid.

  • Because I approached Kiwi Crate

  • the first Kiwi Crate or tinker crate you get is free.

  • If you don't like it, just cancel and never pay anything.

  • I know you're gonna keep it

  • because we do this and our family loves it.

  • It is quality time I get to have with my kids

  • and I, that's all I want right now.

  • So, if you are interested in supporting Smarter Every Day,

  • and spending time investing into the mind of your children,

  • give it a shot. I'm selling it hard, I really am.

  • I know I'm selling it hard,

  • and the reason is, I believe in it.

  • There you go.

  • Hope you enjoyed this video.

  • If you want to subscribe feel free to do that.

  • If not, I'm Destin.

  • You're getting Smarter Every Day.

  • Have a good one.

  • That's pretty cool isn't it.

  • I want to say thank you to a really awesome security guard

  • that decided not to stop me.

  • Thank you very much.

  • What was your name?

  • - Tony.

  • - Tony. Tony has common sense and he's awesome.

  • I really appreciate that.

  • kiwicrate.com/smarter. First link in the description. Bye.

Hey it's me Destin

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車の窓から脱出する方法(SLOW MOTION) - Smarter Every Day 144 (How to Escape from a Car Window (SLOW MOTION) - Smarter Every Day 144)

  • 4 1
    林宜悉 に公開 2021 年 01 月 14 日
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