 I'm back to Kids Fun Science, my name's Grace. And my name's Ken. And today's experiment is a windbag, right? So it's a huge bag. It's got open ends here on this side and an open end on that side. And what we're gonna do is we're going to tie this in right here. So we tied that there so it feels, and Grace is going to blow it up. And we're gonna see how many breaths it takes for Grace to blow up, okay? Yeah, you can do it any way you want. You don't have to hold it that way. But I'm just saying, she's gonna try to blow it up when I count how many breaths, okay? Wait, stop for a second, that's one. How many do you think it's gonna take to blow up? A hundred? Five, two, three, get in there, four, five, six, seven, eight, nine, 10, 11, 12, don't hyperventilate. 13, 14, 15, 16, 17, 18, 19. All right, stop. You wanna try it, let me help you out, let's go. Okay, that was 20 and she wasn't even close. So you wanna try a different way? Or the same way, you could do this with a breath. How do you wanna do it? Wait, that's not here. All right, two, three, four. That looks like it's working any better, right? So, what happens if I tell you I can do it with one breath? Yeah. You think I can? No. Okay, so go ahead and stand over here. Um, I'm a little dizzy. You're dizzy? Yeah. So the trick is right here, not to hold it like this, kind of like you were doing, right? Two breaths, and that's not a hundred. So, the secret is for newly's principle, when the air is pushed in with one big opening, it goes all the way in. Hold it back, out this way more. Close. You wanna back up a little bit? No. There you go, got it. Ta-da. You did it. The science behind the windbag is that it's a long, narrow plastic bag about eight foot long and eight inches wide. I have in the description where you can buy it. The bag can be blown up the old fashioned way like we saw Grace try in the video, which you saw took many, many attempts and still didn't even come close to filling the bag. But with the help of Bernoulli's principle, it makes it a lot easier. By holding the mouth of the bag at arm's length and blowing into the bag, you set up a region of reduced pressure since the air is moving. Moving air exerts less pressure than still air. Since the outside air pressure is greater than the air pressure of the mouth of the bag, the air rushes into the room to fill the bag much faster than if you tried it to blow it up the old fashioned way. It might take a time or two to get it down pat, but once you do, you'll have it in one breath.