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1500 Ping Pong Balls + Liquid Nitrogen + Trash Can


Posted on September 25, 2012, at 12:32 p.m. ET

Step one: fill a bottle with liquid nitrogen

Step two: close the bottle, throw it in the garbage can, fill it with ping pong balls

Step three: cover your ears

Step four: clean up

Here's the original video

View this video on YouTube

It's not entirely clear what this demo is trying to teach, beyond this: the reason the bottle explodes is because liquid nitrogen becomes a gas at room temperature. Nitrogen takes up more space as a gas than as a liquid, causing the closed bottle to rupture violently. The ping pong balls, I think, are mostly just for show.