Absolute Viscosity

Definition - What does Absolute Viscosity mean?

Absolute Viscosity is the force needed by a fluid to overcome its own internal molecular friction so that it can flow. This tangential force acts on a unit area which is needed to make the liquid move in a horizontal plane with respect to another plane with a unit velocity while the liquid molecules maintain a unit distance apart. In the field of fluid mechanics absolute viscosity is also known as dynamic viscosity.

Petropedia explains Absolute Viscosity

Absolute viscosity and kinematic viscosity are important measures of fluid viscosity. In general sense, absolute viscosity also refers to the “thickness” of a fluid. 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 shear stress. Shear stress in the fluid is created by the intermolecular friction exerted when layers of fluid attempt to slide by one another.

Absolute or Dynamic viscosity is directly proportional to the shear stress and is expressed by the symbol (u) and has the SI units of Newton second per square meter.

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