A flow meter is a devise that is used to measure the flow rate of a fluid moving through a pipe. It does this by placing a restriction in the path of the fluid's flow. The pressure difference is before and at the obstruction is measured, and from a combination of Bernoulli's equation and the continuity equation the flow rate can be determined using equation 1.

Q = Flow Rate

A = Cross-Sectional Area

P = Pressure

ρ = Density

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