Blowing Up A Balloon With A Single Breath...

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Transcript

00:00Okay, if I ask you to blow up a balloon, no problem with that, right?

00:02No problem.

00:03Alright, so I have one here for you.

00:04Here it is.

00:05Now, a regular balloon is stretchy, but that's not really fair.

00:08Okay.

00:09So that's why this one's 8 feet long, 10 inches around, and holds 45 liters of air.

00:14Here's what we're going to do.

00:15We tie off the end like this.

00:16I want you to breathe into the bag.

00:18How many breaths do you think it's going to take you to blow up the bag?

00:21Hundreds.

00:22Okay, here we go.

00:23Alright.

00:24This could be a long, long show.

00:25He always does this to me.

00:26Alright, so here we go.

00:28I want you to put your hand right here, and you're just going to blow right into the

00:30bag.

00:31Okay.

00:32And that'll be one breath, and then take your mouth off.

00:33There's one.

00:34That's good.

00:35Keep going.

00:36This might be a good time for you to, I don't know, get a sandwich, eat a cookie.

00:43How many so far?

00:44No, don't pass out.

00:45How many?

00:46Six.

00:47Six.

00:48Alright, let's slide it down.

00:49Look at this.

00:50Here.

00:51I'm getting lightheaded.

00:52This is great.

00:53This is six breaths of air.

00:54This is 12.

00:55This is, I don't know, maybe 18.

00:56Let's say 24.

00:57I'm going to say 24 for the entire bag.

00:58Fair enough?

00:59Fair enough.

01:00Alright.

01:01What if you could do it less?

01:02If you could do it in a single breath of air, that would be totally amazing, right?

01:03It would be awesome.

01:04In order to do that, you're going to stand back there, so you can see what's going to

01:05happen.

01:06Okay.

01:07So you head back that way.

01:08Alright, watch this.

01:09So now, there's no air in the bag.

01:10So the secret is, you put your fingers in the bag like this.

01:11You open up the bag, and then you blow a fast stream of air into the bag.

01:12Just like this.

01:13Okay.

01:14Alright.

01:15Alright.

01:16Alright.

01:17Alright.

01:18Alright.

01:20Alright.

01:21Alright.

01:22Alright.

01:23Alright.

01:24Alright, so you do this like this.

01:25You open up the bag, and then you blow a fast stream of air into the bag, but you've got

01:26to keep your mouth off the bag.

01:27Watch this.

01:28Okay.

01:29Bam.

01:30And that is the single breath of air.

01:34I did it by using Bernoulli's principle.

01:39In 1738, Daniel Bernoulli discovered that fast-moving air creates an area of low pressure.

01:46The secret is, the bag is away from my mouth, so that fast-moving air going into the bag

01:52actually allows the air molecules on the outside of the bag to go into the bag from the side,

01:58filling the bag with a single breath of air.

02:00Fast-moving air flowing into the bag actually creates a low-pressure area around the outside

02:06of the bag, so the bag fills instantly.

02:10Ready?

02:11And a long puff.

02:12Ready?

02:13That's it.

02:14Seal it.

02:15Grab it.

02:17Perfect.

02:18Isn't that amazing?

02:19Amelia, when is this most fun?

02:20Well, when you have a lot of friends.

02:22We have a lot of friends.

02:23Alright guys, you ready?

02:24Go.

02:25Seal it off.

02:26Nice.

02:27Ta-da!

02:28Nice job.

02:29Who would think that you could have this much fun with a great big long bag and some knowledge

02:39about controlling the flow of air?

02:41It's Bernoulli's principle and it's all about flight.

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