Difference Between Kinematic And Dynamic Viscosity

The resistance of a fluid to flow or deform when subjected to a force is called viscosity. Dynamic viscosity is expressed as the ratio of shear stress to shear strain. The unit of measurement is Pa s. Usually, it is measured in centipoise (cP). Kinematic viscosity is expressed as the ratio of fluid dynamic viscosity to its density. The unit of measurement is m2s-1.

Any two different fluids can have the same dynamic viscosity but will never have the same kinematic viscosity because of the density difference. Here we are discussing the major Difference Between Kinematic And Dynamic Viscosity.

Difference Between Kinematic And Dynamic Viscosity

Properties Kinematic Viscosity Dynamic Viscosity
Also known as Diffusivity of momentum Absolute Viscosity
Represents Inertia as well as viscous force The viscous force of the fluid
Symbol ν μ
Ratio The ratio of dynamic viscosity to density The ratio of shear stress to shear strain
Used When inertia, as well as viscous force, is dominant When viscous force is dominant
Density Dependent Independent
Unit m2/s Ns/m2

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Frequently Asked Questions – FAQs

Define viscosity.

It is the resistance offered by a fluid to flow or deform when subjected to a force is known as viscosity.

What is the unit of kinematic viscosity?

The unit of kinematic viscosity is m^2/s.

What is the symbol used to represent the dynamic viscosity?

Dynamic viscosity is represented using the symbol μ.

What is kinematic viscosity also known as?

The kinematic viscosity is also known as diffusivity of momentum.

Can any two different fluids have the same kinematic viscosity?

No, they cannot have the same kinematic viscosity because of the difference in densities.

How are viscosity and flow rate related?

As the viscosity increases, the flow rate decreases. The flow rate is inversely proportional to viscosity.

What is kinematic viscosity?

Kinematic viscosity is a measure of a fluid’s internal resistance to flow under gravitational forces. It is expressed as the ratio of fluid dynamic viscosity to its density. The unit of measurement is m2/s.
Test your knowledge on Kinematic and dynamic viscosity differences

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