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Poise
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The poise (symbol P; pronounced /ˈpwɑ¢°z/) is the unit of dynamic viscosity in the centimetre gram second system of units. It is named after Jean Louis Marie Poiseuille.
1 P = 1 g¡¤cm−1¡¤s−1
The analogous unit in the International System of Units is the pascal second (Pa¡¤s):
1 Pa¡¤s = 1 kg¡¤m−1¡¤s−1 = 10 P
The poise is often used with the metric prefix centi-. A centipoise is one one-hundredth of a poise, and one millipascal-second (mPa¡¤s) in SI units. (1 cP = 10-2P = 10-3 Pa¡¤s) Centipoise is properly abbreviated cP, but the alternate abbreviations cps and cPs are also commonly seen.
Water has a viscosity of 0.0089 poise at 25 ¡ÆC, or 1 centipoise at 20 ¡ÆC.
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