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Monday, October 24, 2016

What is Fluid?

Substances capable of flowing are fluids. They don't have their own shape and they take shape of containing vessel. Fluid undergoes shear deformation continuously till force acts on it.

Liquid is a incompressible fluid as they are difficult to compress for practical purpose so they have definite volume. Gas is a compressible fluid. Their volume varies with temperature & pressure.

If we talk of ideal fluid then that fluid should not have Viscosity, Surface Tension and compressibility. But in nature all fluids have one or all properties depending on condition so they are called real or practical fluids. Hence they pose certain amount of resistance when set in motion.