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Continuity equation-If the mass flow rate is constant, the quantity of fluid flowing past one place must equal the amount flowing past another point, according to the continuity equation. According to the law of conservation of mass, this statement is simply a recitation.

The use of the continuity equation is appropriate if we consider the water that emerges from the faucet to be an incompressible fluid. As stated in this equation, the quantity of water flowing through an any cross-section over time is constant. Considered as an incompressible fluid, water flowing from a faucet is ideal for application of the continuity equation. This equation states that the amount of water flowing across a cross-section at any given moment is constant.