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|Unit system||Centimetre–gram–second system of units|
|Unit of||Dynamic viscosity|
|Named after||Jean Léonard Marie Poiseuille|
|Derivation||1 P = 1 dyn⋅s/cm2|
|1 P in ...||... is equal to ...|
|CGS base units||1 cm−1⋅g⋅s−1|
|SI units||0.1 Pa⋅s|
The poise (symbol P; / /,) is the unit of dynamic viscosity (absolute viscosity) in the centimetre–gram–second system of units (CGS). It is named after Jean Léonard Marie Poiseuille (see Hagen–Poiseuille equation). The centipoise (1 cP = 0.01 P) is more commonly used than the poise itself.
Dynamic viscosity has dimensions of , that is, .
The poise is often used with the metric prefix centi- because the viscosity of water at 20 °C (standard conditions for temperature and pressure) is almost exactly 1 centipoise. A centipoise is one hundredth of a poise, or one millipascal-second (mPa⋅s) in SI units (1 cP = 10−3 Pa⋅s = 1 mPa⋅s).
The CGS symbol for the centipoise is cP. The abbreviations cps, cp, and cPs are sometimes seen.
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