## What is Dynamics viscosity?

It is a quantity measuring the force needed to overcome internal friction in a fluid.

## What is Kinematic viscosity?

It is a quantity that represents the dynamic viscosity of a fluid per unit density.

Let us have a deep insight into the difference between kinematic and dynamic viscosity.

## Difference :

• Measure a fluid's resistance to flow when an external force is applied is called dynamic viscosity while measure it under the weight of gravity is kinematic viscosity.
• Kinematic results are dependent on the density of the fluid and density is not a factor with dynamic viscosity.
The unit of measure for the dynamic viscosity is Centipoise (cP).

The unit of measure for the kinematic viscosity is Centistokes (cSt).
• For measuring dynamic viscosity rotational viscometers are used while for kinematic viscosity capillary tube is used.
• In dynamic viscosity, the viscosity related to an external force applied to non-newtonian fluids while kinematic viscosity inherent viscosity of Newtonian fluids, that does not change with a change in applied force.
• Dynamic viscosity is the quantitative expression of fluid’s resistance to flow whereas kinematic viscosity is the dynamic viscosity of a fluid divided by its density.
• Dynamic viscosity is symbolized by either ยต or ‘n’ while kinematic viscosity is mathematically symbolized by v.
• Dynamic viscosity is sometimes referred to as absolute viscosity, or just viscosity, whereas kinematic viscosity is sometimes referred to as momentum diffusivity.