What is a fluid?(Define, Examples)

Answer:

A fluid is a substance that does not permanently resist distortion.

An attempt to change the shape of a mass of fluid results in layers of fluid sliding over one another until a new shape is attained.

During the change in shape, shear stresses exists, the magnitude of which depend on the viscosity of the fluid and the rate of sliding, but when a final shape has been reached, all shear stresses will have disappeared.


A fluid in equilibrium is free from shear stress.

Examples:


Liquids, gases etc.