The Liquid Hammer Toy You Can't Buy

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Collapsing cavitation bubbles aren't very well understood. They make a strange sound and a flash of light. But why?

Chinese Spouting Bowl: https://www.youtube.com/watch?v=0yVEXRM_3xc
Practical Engineering - Water Hammer: https://www.youtube.com/watch?v=xoLmVFAFjn4

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