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Just a stone's throw forms a supersonic jet

Objects hitting water can move air at the speed of sound

A stone hitting a pond can produce a tiny supersonic splash, a new study has found.

Researchers studying the shape of an air cavity made when an object hits a liquid noticed a similarity to the shape of the nozzles that are in supersonic jet engines. Sure enough, air escaping from the cavity can reach supersonic speeds, the team reports in a paper published online January 11 in Physical Review Letters.

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