The specifying of temperature is important because viscosity changes with temperature in general, viscosity decreases as temperature is raised. The basic unit is the poise however, viscosities commonly encountered represent fractions of the poise, so that the centipoise (1 poise = 100 centipoises) proves to be the more convenient unit.
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It is defined as the shear stress divided by the rate of shear strain. It is defined in terms of the force required to move one plane surface continuously past another under specified steady-state conditions when the space between is filled by the liquid in question. Viscosity is a property of liquids that is closely related to the resistance to flow.
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