Difference Between Kinematic And Dynamic Viscosity

The resistance of a fluid to flow or deform when subjected wit 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 same kinematic viscosity because of density difference. Here we are discussing 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 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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