the force required to move a unit plane surface over another plane surface at unit velocity when surfaces are separated by a layer of fluid of unit thickness.
Unit of Absolute Viscosity in the metric system:
poise and centipoise1 poise = 1 gram / (cm) (sec) and1 centipoise = 1/100 poise
Unit of Absolute Viscosity in the English system:
slugs / (ft) (sec);1 slug / (ft) (sec) = 1 / 0.002089 poise
the absolute viscosity divided by density.
Unit of Kinematic Viscosity in the metric system and commonly used in the countries using the English system:
stoke and centistoke;
1 stoke = 1 poise / density (gm / mL)
1 centistoke = 1/100 stoke
Other units of Kinematic Viscosity in the English system, the most practical unit for making calculations is ft2 / sec; 1 ft2 / sec = 92903 centistoke and 1 centistoke = 1.076 x 10-5 ft2 / sec