Discussion
Continuity equation is based on :
Answer: A
The continuity equation is based on the principle of conservation of mass.
For steady flow, the mass entering a control volume per second must equal the mass leaving it. For an incompressible fluid in a pipe this gives \(A_1V_1 = A_2V_2\): where the section narrows, the velocity rises.
Conservation of momentum gives the momentum equation, and energy conservation gives Bernoulli's equation. Weight is not a separately conserved quantity, and kinetic energy alone is not conserved in real flow.
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