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Published on Nov 10, 2006
2 holes are punctured at a slanting/glancing angle into a ping pong ball. It is then immersed in liquid nitrogen. The air inside it cools. This lowers the air pressure inside the ping pong ball. Liquid nitrogen then partly fills the ping pong ball. The ping pong ball will start to spin as cold liquid nitrogen boils, shooting out cold nitrogen gas from these 2 holes and propels the ping pong ball and rotates it on a vertical axis