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|
|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|
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Frequently Asked Questions – FAQs
What is the unit of kinematic viscosity?
The unit of kinematic viscosity is m^2/s.