Incompressible fluids are the imaginary fluids which are considered for the calculation of various factors associated with fluid dynamics. These fluids cannot change its volume due to any external pressures as the compressibility is assumed to be zero.

We know that,

Compressibility,

1/K = dρ/(ρ dp) ( 1/K = 0 )

0 = dρ/(ρ dp)

Or,

dρ = 0

i.e.,

ρ = constant

It means that mass density will remain constant for incompressible fluids.

**Note:**

All existing fluids are compressible fluids. As compare to the gases, the liquids are considered as incompressible fluid where water is assumed as standard incompressible fluid.

**Links of Previous Main Topic:-**

- Ideal gas or perfect gas
- Introduction about air standard cycles
- Properties of pure substances introduction
- Vapour compression refrigeration cycle introduction
- Basic fluid mechanics and properties of fluids introduction
- Definition of fluid
- Properties of fluids
- Classification of fluids
- Kinematic viscosity
- Variation of dynamic viscosity with temperature
- Compressible fluids

**Links of Next Mechanical Engineering Topics:-**