Kamifusen (紙 風 船) Self-inflating paper balloon - Kamifusen meaning paper (kami) balloon (fusen)

Made for teachers and parents Kamifusen (紙 風 船) Self-inflating paper balloon - Kamifusen meaning paper (kami) balloon (fusen) Kishi's Japanese Traditional Toy Kamifusen 50 Pieces - https://amzn.to/34WtPZf Filming equipment Cell Phone Tripod 54 inch Travel Tripod with Bluetooth Remote - https://amzn.to/34REzbB Blue Yeti USB Microphone - https://amzn.to/3ePJwGu Green screen & lights - https://amzn.to/2XT9Yc1 Kamifusen (紙 風 船) self-inflating paper balloon and it’s a Japanese toy, which means paper balloon. Kamifusen meaning paper (kami) balloon (fusen), is a traditional Japanese toy. You can inflate it by hitting it in the palm of your hand. Despite having a hole being open to air, a paper balloon remains inflated. One might expect that bouncing the paper balloon would force air out of its hole and cause the balloon to deflate. Instead, the hitting it actually increases the paper balloon to inflate, as seen here. Some physicists say the property that causes a crumpled sheet of paper to slowly unfold is similar. This somewhat helps expand the scrunched paper balloon. However, it does not fully explain the inflation, since the unfolding does not completely smooth out plain crumpled paper all the way. Other physicists have suggested that the bouncing cause the pressure changes indie the balloon that alternately push out the and pull in air. That’s ,true, but it is not obvious how the pressure changes and why more air comes in than goes out – a requirement for the balloon to inflate. Part of the genius is the paper from which it is made. The paper is not only lightweight and relatively impermeable to air, but it also has a degree of plasticity that allows it to deform easily and retain its resulting shape. Because of those properties, the balloon inflates to a volume with its air content and maintains that volume until additional air is added. As a result, a squashed balloon can accumulate air and eventually inflate to its full size from repeated bouncing, even though the net pumping from a single bounce may be small. A balloon made of plastic, rubber, or any other material that does not share the key properties of paper would not inflate as the Japanese balloon does. Pressure changes accompany the oscillation. When the balloon is contracted, the inside pressure is higher than atmospheric pressure p0; when expanded, it is lower than p0. The pressure difference between balloon and atmosphere works to restore the balloon to its equilibrium position. Hitting it again and again repeats this process: shocks to the internal air pressure increasing its volume, and thus drawing more air in, until the balloon is nearly fully inflated. It never fully inflates, of course, because the internal air pressure is not high enough to overcome the rigidity of the folds/ crumples in the paper (you'd have to inflate and seal the hole to do that). See Self-inflating EGG experiment https://youtu.be/X7jEWA5coPY Here is where I bought it: https://www.teachersource.com/product/paper-balloon-paradox/air-pressure-rockets