Discussion
Bernoulli's equation is applicable for:
Answer: A
Bernoulli's equation applies to incompressible and non-viscous flows, and in its usual form along a streamline in steady flow. It is derived for an ideal fluid that has constant density and has no friction, so energy is conserved with no loss to viscosity. In viscous or compressible flow additional terms are required (head loss, change of density), so those options are wrong.
The equation states that the sum of pressure head, velocity head and elevation head stays constant along a streamline.
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