Torricelli's law
noun
Tor·ri·cel·li's law
variants
or less commonly Torricelli's theorem
-lēz-
: a law in hydrodynamics: the speed of efflux of a liquid from an orifice is equal to that of a body falling freely through a distance equal to the total head of the liquid at the orifice
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Merriam-Webster unabridged
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