# What is Fluid | Type of fluids

__Fluid__

__Fluid__

- Fluid is defined as substance which has capacity to flow.

- Fluid is a substance that deform continuously under the section of shear stress, no matter if it is small.

__Fluid Mechanics__

__Fluid Mechanics__

Fluid mechanics is the branch of engineering science which deals with the behavior of fluids at rest as well as motion.

__Type of fluids__

__Type of fluids__

The fluids may be classified into following types

**1) Ideal fluid : **A fluid, which is incompressible and having no viscosity, is known as ideal fluid.

**2) Real fluid : **A fluid which posses viscosity, is known as real fluid. All fluids in actual practice are real fluid.

**3) Newtonion fluid : **A real fluid, in which the shear is directly proportional to the rate of Shear strain is known as newtonion fluid.

**4) Non-newtonion fluid : **A real fluid in which the shear stress is not proportional to the rate of shear strain is known as Non-newtonion fluid.

**5) Ideal plastic fluid : **A fluid in which shear stress is more than the yield value and shear stress is proportional to rate of strain is known as ideal plastic fluid.