Fluid and some of its properties.



A fluid may be defined as a substance which deforms continuously
when subjected to a shear stress or in other words a fluid is a substance which
cannot withstand shear stress. Fluid mechanics deals with the behavior of
fluids at rest and in motion. Fluids may be of liquid or gaseous forms. Liquid
is practically incompressible and occupy definite volume and have free
surfaces. Whereas, gaseous

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