Principles of Flighteasy#502
The continuity equation states that for an incompressible fluid in a streamtube:
A
Pressure × velocity = constant
B
Area × velocity = constant (mass flow is conserved)
CorrectC
Density × pressure = constant
D
Velocity × temperature = constant
Explanation
The continuity equation (A1V1 = A2V2) shows that when a streamtube narrows, velocity must increase to maintain constant mass flow.
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