# Dynamic Viscosity

## Definition - What does Dynamic Viscosity mean?

Dynamic viscosity is the force needed by a fluid to overcome its own internal molecular friction so that the fluid will flow. In other words, dynamic viscosity is defined as the tangential force per unit area needed to move the fluid in one horizontal plane with respect to other plane with a unit velocity while the fluid's molecules maintain a unit distance apart.

Dynamic viscosity is also referred as absolute viscosity in the field of fluid mechanics.

## Corrosionpedia explains Dynamic Viscosity

Dynamic viscosity is one of the measures of fluid viscosity. Another measure of fluid viscosity is kinematic viscosity.

Viscosity is an important property of fluids and is used to understand a fluid's behavior and the way it will move when it comes in contact with solid boundaries. A fluid's viscosity is the measure of its resistance to its gradual deformation by tensile or shear stress. Shear stress in the fluid is created by the intermolecular friction exerted when layers of fluid attempt to slide by one another.

Dynamic viscosity is directly proportional to the shear stress and is expressed by the symbol () and has the SI units of N s/m^{2} (Newton second per square meter).