Fluid Mechanics
In an incompressible flow of fluid, the fluid

Is frictionless
Temperature remains constant
Compressibility is greater than zero
Density does not change with pressure & temperature

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Remains constant over the cross-section
Varies parabolically across the cross-section
Is zero at the wall and increases linearly to the centre
Is zero at the centre and varies linearly with the radius

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