Hydraulics & Fluid Mechanics
Fluid is a substance that

cannot be subjected to shear forces
always expands until it fills any container
cannot remain at rest under action of any shear force
has the same shear stress.at a point regardless of its motion

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Hydraulics & Fluid Mechanics
The normal stress is same in all directions at a point in a fluid

irrespective of the motion of one fluid layer relative to an adjacent layer
only when the fluid is frictionless
only when the fluid is incompressible and has zero viscosity
When there is no motion of one fluid layer relative to an adjacent layer

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