The Venturi-meter is a device to measure the 0f flow speed of incompressible fluid. It consists of a tube with a broad diameter and a small constriction at the middle as shown in figure below. A manometer in the form of a U-tube is also attached to it, with one arm at the broad neck point of the tube and the other at constriction as shown in figure. The manometer contains a liquid of density ρm. The speed v1 of the liquid flowing through the tube at the broad neck area A is to be measured from equation of continuity.
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Pressure variation with depth
Pascal's Law
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