Torricelli's law

noun
Tor·​ri·​cel·​li's law
variants: or less commonly Torricelli's theorem \-​lēz-​ \

Definition of Torricelli's law 

: 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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History and Etymology for Torricelli's law

after Evangelista Torricelli †1647

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