Blowing Up This Bag With Just One 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.

00:03All right.

00:04So I have one here for you.

00:05Here it is.

00:06Now, 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.

00:23All right.

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

00:25He always does this to me.

00:26All right.

00:27So here we go.

00:28You're going 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.

00:48All right.

00:49Let's slide it down.

00:50Look at this.

00:51Here.

00:52This is great.

00:53I'm getting lightheaded.

00:54This is great.

00:55This is six breaths of air.

00:56So if this is six, this is 12, this is, I don't know, maybe-

00:58Let's say 24.

00:5918.

01:00I'm going to say 24 for the entire bag.

01:01Fair enough?

01:02Fair enough.

01:03All right.

01:04What if you could do it less?

01:05If you could do it in a single breath of air, that would be totally amazing, right?

01:07It would be awesome.

01:08And in order to do that, you're going to stand back there so you can see what's going to

01:12happen.

01:13So you head back that way.

01:14All right.

01:15Watch this.

01:16So now, there's no air in the bag.

01:17So the secret is, you put your fingers in the bag like this.

01:20You open up the bag, and then you blow a fast stream of air into the bag, but you've got

01:25to keep your mouth off the bag.

01:26Watch this.

01:27Bam.

01:28And that is the single breath of air.

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

01:38In 1738, Daniel Bernoulli discovered that fast-moving air creates an area of low pressure.

01:47The secret is, the bag is away from my mouth.

01:50So that fast-moving air going into the bag actually allows the air molecules on the outside

01:54of the bag to go into the bag from the side, filling the bag with a single breath of air.

02:01Fast-moving air flowing into the bag actually creates a low-pressure area around the outside

02:06of the bag.

02:07So the bag fills instantly.

02:10Ready?

02:11And a long puff.

02:12Ready?

02:13That's it.

02:14Seal it.

02:15Grab it.

02:16Slide it down.

02:17It works.

02:18Perfect.

02:19Isn't that amazing?

02:20Amelia, when is this most fun?

02:21Well, when you have a lot of friends.

02:22We have a lot of friends.

02:23All right, guys.

02:24Let's go.

02:25See you later.

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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