#VISCOSITY DEFINITION CHEMISTRY SOFTWARE#
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USA.įor Sutherland's formula and values for : Crane Company. Since Sutherland's formula is an empirical fit of measured data, the following table of reference data is needed.Ī gas with reference viscosity μ 0 = centiPoise,įor gas viscosity: Chemical Rubber Company (CRC). Gas viscosity can be modeled by Sutherland's formula:
Note that as an engineering quantity, the temperatures used are in the Rankine scale. It is primarily a function of temperature, and can be modeled in terms of temperature with the input of experimental reference measurements.
Gas viscosity is only weakly dependent on pressure near atmospheric pressure. The viscosity of gases near room temperature are in the centiPoise range, so that is a commonly used unit. The viscosity of a gas can be thought of as a measure of its resistance to flow and is measured in the CGS unit Poise = dyne sec/cm 2.