An orifice plate is a device used for measuring the volumetric flow rate. It uses the same principle as a Venturi nozzle, namely Bernoulli's principle which states that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases and vice versa.
Read more about Orifice Plate: Description, Uses, Incompressible Flow Through An Orifice, Flow of Gases Through An Orifice, Permanent Pressure Drop For Incompressible Fluids
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—Vladimir Nabokov (1899–1977)