# Poise

The **poise** (symbol P, /ˈpɔɪz/) is the unit of dynamic viscosity in the centimetre–gram–second system of units.^{[1]} It is named after Jean Léonard Marie Poiseuille.

The analogous unit in the International System of Units is the pascal-second (Pa·s):

The poise is often used with the metric prefix *centi-* because the viscosity of water at 20 °C is almost exactly 1 centipoise. A **centipoise** is one hundredth of a poise, equal to one millipascal-second (mPa·s) in SI units (1 cP = 10^{−3} Pa·s = 1 mPa·s).

The centipoise is properly abbreviated cP, but the alternative abbreviations cps, cp, and cPs are also commonly seen.

Water has a viscosity of 0.00899 poises at 25 °C and a pressure of 1 atmosphere (0.00899 P = 0.899cP = 0.899 mPa·s).^{[2]}

## See also

Look up in Wiktionary, the free dictionary.poise |

## References

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