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Water hammer

From Biology-Online Dictionary | Biology-Online Dictionary
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water hammer

(Science: physics)

1. A vessel partly filled with water, exhausted of air, and hermetically sealed. When reversed or shaken, the water being unimpeded by air, strikes the sides in solid mass with a sound like that of a hammer.

2. A concussion, or blow, made by water in striking, as against the sides of a pipe or vessel containing it.