What is a venturi meter?

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(N/A) venturi meter is a device used to measure the rate of flow of an incompressible fluid through a pipe.
It operates on the principle of Bernoulli's theorem.
It consists of a constriction or a 'throat' in the pipe,which causes a pressure difference between the wide part of the pipe and the narrow throat.
By measuring this pressure difference using a manometer,the velocity and the volume flow rate of the fluid can be calculated.

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