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Viscosity Information
Viscosity
Measurement of a fluid's resistance to flow. The common metric unit
of absolute viscosity is the poise, which is defined as the force in
dynes required to move a surface one square centimeter in area past a
parallel surface at a speed of one centimeter per second, with the
surfaces separated by a fluid film one centimeter thick. In addition to
kinematic viscosity, there are other methods for determining viscosity,
including Saybolt Universal Viscosity (SUV), Saybolt Furol Viscosity,
Engier Viscosity, and Redwood Viscosity. Since viscosity varies inversely with temperature, its value is meaningless until the
temperature at which it is determined is reported.
Viscosity Index
A commonly used measure of a fluid's change of viscosity with
temperature. The higher the viscosity index, the smaller the relative
change in viscosity with temperature.
Viscosity Grade
Any number of systems which characterize lubricants according to
viscosity for particular applications, such as industrial oils, gear
oils, automotive engine oils, automotive gear oils, and aircraft piston
engine oils. |