In any given airflow, rho x A x V = constant, where:
rho = density
A = cross-sectional area of the flow
V = Velocity
What is this principle known as?
Equation of continuity
Energy and mass can neither be created nor destroyed. When a fluid is in motion, it must move in such a way that mass is conserved. Mass flow will remain a constant value at all points along the tube. The air mass flow through the tube will be the product of the cross-sectional area (A), the airflow velocity (V) and the air density (rho).
- Equation of Continuity:
A × V × rho = Constant
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