•    Fluids which have no viscosity and surface tension and those are incompressible are called as ideal fluid. Ideal fluids are imaginary fluids and do not exist in the nature.

•    As water is incompressible, it is considered as an ideal fluid.

•    Fluids which possess the properties like viscosity, surface tension and compressibility are called as real or practical fluids.

•    Whenever the motion takes place, the tangential or shears force is always offered by the fluid.

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