Torricelli's Law
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Torricelli's Law states that the speed of a fluid flowing out of an opening under the force of gravity is proportional to the square root of the product of twice the acceleration of the gravity multiplied by the height h, the distance between the level of the surface and the center of the opening:
This speed coincides with the speed the fluid would have in a free-fall from the height h.
The law was named after the Italian scientist Evangelista Torricelli who discovered this law (not in this form) in 1643.
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