In the SI system the dynamic viscosity units are N s/m 2, Pa s or kg/(m s) - where (1) can be rearranged to express Dynamic viscosity as Μ = dynamic viscosity of fluid (N s/m 2 )Įquation (1) is known as the Newtons Law of Friction. The shearing stress between the layers of a non turbulent fluid moving in straight parallel lines can be defined for a Newtonian fluid as Dynamic (absolute) viscosity is the tangential force per unit area required to move one horizontal plane with respect to an other plane - at an unit velocity - when maintaining an unit distance apart in the fluid. There are two related measures of fluid viscosityĪbsolute viscosity - coefficient of absolute viscosity - is a measure of internal resistance. viscosity is the measure of a fluid's resistance to flow.The shear resistance in a fluid is caused by inter-molecular friction exerted when layers of fluid attempt to slide by one another. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. Viscosity is an important fluid property when analyzing liquid behavior and fluid motion near solid boundaries.
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