Can You Solve The Paper Balloon Paradox? The Amazing Self-Inflating Japanese Paper Ball (Kamifusen)

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In this video I show you on odd phenomenon in which a paper balloon inflates itself when it seems it should be deflating. How does the Japanese paper ball, the Kamifusen, work? How does it inflate itself?

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DISCLAIMER: Any experiment you try is at your own risk

[soblo]

who else thought that it is going to self-inflate on the table at the start?

[GhostyKingdom]

1:26 when you're trying to increase your sims skill but don't want to wait.

[ON]

Meanwhile a new juggling record has also been created!

[KnightSlasher]

Is this the new rubix cube, if so it will never be solve and instead will be in my closet waiting until I get bored

[jars]

3:07
The Ball: I served you as a lab partner, don't cut me please. Someone save me! I gonna die! Nooo...oooo!

[greekfire]

When the best part of a game is that it's free, you know that it's going to be a *great* game.

[bigboyxander]

You're basically a more understandable Vsauce

[ezycuberz]

4:35 onwards
Class teacher (action lab) to me:-
Why are you runnin'!!?
Why are you runnin'!!?
Me:-
Help!! Help me!!!! Help

[wenxinball]

1900: I bet there will be flying cars in the feature

2019: man hitting beach ball to inflate it

[TechsScience]

So there is a complex theory on how the Paper inflates

[dobluo]

2:52 that sound was so funny
I wonder what he said

[KalijahAnderson]

If that was the whole story then quick little hits on the table would inflate it.

When the ball is moving through the air the air outside is moving faster (from the balls frame of reference) than the air inside. Bernoulli's principle states that fast moving air has lower pressure. While the difference is rather small it's just enough to overcome the weak structure of the tissue paper resulting in air being pulled in through the hole during the entire time it's floating around in the air. The quick taps in the air are also fighting the airs viscosity more as it tries to force it it out the small hole thus reducing the air loss even further. If you have a far enough drop you would inflate the ball just from dropping it. I've done this myself as part of a physics demonstration in school as we tackled this little "paradox" in physics class.

[holohulolo]

I used to play with these as a kid, and in all those times I never realised it inflates itself. I often blow the air in first. I think mine had a thinner paper, it was really cheap.

[aaronschen]

where is the recoil force coming from? Elastic return of the paper deformation or expanding of the air that was compressed in the initial hit?

[YTjndallas]

It’s structure acts as a spring causing an “inhalation” response after every hit.

[michelbourgeois]

Where do you get all your ideas!? Lol Good video again! Thank you.

[Audio_Simon]

I think Helmholtz resonance helps this principle. The hole will create a reasonably high frequency fundamentals resonance. Above resonance (steep impulse attack response of a hit) air flow will be attenuated, however as the paper regains its shape slowly the air draw will be below resonance and can flow unrestricted.

Just my hypothesis

[toamaori]

your explanation was just what I was thinking but it was nice to see it articulated better than I could have :)

[djgulston]

Honestly, I thought you were just gonna chuck it into a vacuum chamber or something.

[alusias]

that ball was a huge part of my childhood and I couldn’t for my life figure out why it wouldn’t deflate after playing with it so violently for so long... thx for video!