The fluid mechanics is the branch of engineering science, which deals with the behavior of fluids either in rest or in motion.

•    The study of mechanics of fluids at absolute and relative rest is called as fluid statics. Shear stress is always zero in fluid statics.

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•    The study of incompressible fluids under static conditions is called as fluid statics.
•    The study of incompressible gases under static conditions is called as Aerostatics.

The study of mechanics of fluids in motion is called as fluid dynamics. Fluids sustain some shear forces. e.g. flow through pipes, channel etc.

Fluid kinematics deals with translation, rotation and deformation of the fluid element without considering the force and energy causing such a motion.
•    It deals with the velocities, acceleration and the flow patterns only.
•    It does not consider force or energy that produces the velocity or acceleration in the fluid.

Fluid kinetics deals with the relation between velocities and acceleration and the forces, which are extorted by or upon the moving fluids.

Hydralics:

•    Hydraulic ahs been derived from Greek word ‘Hodour’ which means water.
•    Hydraulics is the branch of fluid machines, which deals with the behavior of water (incompressible fluids) either in motion or in rest.

Pneumatics:

Pneumatics is another branch of fluid mechanics, which deals with the behavior of compressible fluids either in motion or at rest.

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