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A tiny, supersonic water jet

By Prospect   August 2010

Make a wish: these elegant forms show what happens beneath the surface of water when a coin-shaped disk falls (or, in this case, is pulled by the attached vertical rod) into it. A vase-like cavity opens up behind the disk, which then collapses into an hourglass shape, from the neck of which the air is pushed out in a jet moving at supersonic speed.

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