the flow must be steady, i.e. the flow parameters (velocity, density, etc...) at any point cannot change with time, the flow must be incompressible – even though pressure varies, the density must remain constant along a streamline; friction by viscous forces must be negligible.
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Answer:
the flow must be steady, i.e. the flow parameters (velocity, density, etc...) at any point cannot change with time, the flow must be incompressible – even though pressure varies, the density must remain constant along a streamline; friction by viscous forces must be negligible.