The poise (symbol P; /pɔɪz, pwɑːz/) is the unit of dynamic viscosity (absolute viscosity) in the centimetre–gram–second system of units. It is named after Jean Léonard Marie Poiseuille (see Hagen– Poiseuille equation). 1   P = 0.1   kg ⋅ m − 1 ⋅ s − 1 = 1   g ⋅ cm − 1 ⋅ s − 1 = 1   dyne ⋅ s ⋅ cm − 2 . displaystyle 1~ text P =0.1~ text kg cdot text m ^ -1 cdot text s ^ -1 =1~ text g cdot text cm ^ -1 cdot text s ^ -1 =1~ text dyne cdot text s cdot text cm ^ -2 . The analogous unit in the International System of Units is the pascal-second (Pa⋅s): 1   Pa ⋅ s = 1   N ⋅ s ⋅ m − 2 = 1   kg ⋅ m − 1 ⋅ s − 1 = 10   P . displaystyle 1~ text Pa cdot text s =1~ text N cdot text s cdot text m ^ -2 =1~ text kg cdot text m ^ -1 cdot text s ^ -1 =10~ text P . The poise is often used with the metric prefix centi- because the viscosity of water at 20 °C (NTP) 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. Liquid water has a viscosity of 0.00890 P at 25 °C and a pressure of 1 atmosphere (0.00890 P = 0.890 cP = 0.890 mPa⋅s). See alsoLook up poise in Wiktionary, the free dictionary.Poiseuille ViscosityReferences^ Gooch, Jan W. (2010). Encyclopedia dictionary of polymers (2nd ed.). Berlin: Springer. ISBN 978-1-4419-6246-1.  ^ Reid, Robert C. (1987). The Properties of Gases and Liquids (4th ed.). McGraw-Hill.  ^ Parker, Sybil P. (1988). Fluid Mechanics Source Book (1st ed.). McGraw-Hill.  ^ Lide, David R. (1994). CRC Handbook of Thermophysical and Thermochemical Data (1st ed.). CRC Press.  ^ " Viscosity Viscosity of Liquids", in CRC Handbook of Chemistry and Physics, 91st Edition, W.M. Haynes, ed., CRC Press/Taylor and Francis, Boca Raton, Florida

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