Hot bodies fall fast

New high-speed videos show that a hot sphere falls through liquid more than twice as fast as a cold sphere, a finding that may someday help ease high-speed submarines through the sea.

The spheres can move faster thanks to the same phenomenon that makes water droplets skate across a frying pan, known as the Leidenfrost effect. A thin layer of vapor forms beneath the water droplet and protects it from evaporating quickly, allowing it to levitate and skitter about freely.

Learn more here.

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