where p1 is the fluid density at point 1, A1 is the area across which fluid enters the control volume, and V1 is the average velocity of the fluid across A1. The variables p2, A2, and V2 are density, area, and average velocity at point 2.
For incompressible flows under circumstances where mass inside the control volume does not increase or decrease, the density of the fluid is
constant (p1 = p2) and the continuity equation can be written in its more usual form:
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