Hydraulics & Fluid Mechanics
According to Bernoulli’s equation for steady ideal fluid flow

principle of conservation of mass holds
velocity and pressure are inversely proportional
total energy is constant throughout
the energy is constant along a stream-line but may vary across streamlines

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Hydraulics & Fluid Mechanics
Fluid is a substance that

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

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

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

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