The poise (symbol P; /pɔɪz, pwɑːz/) is the unit of dynamic viscosity (absolute viscosity) in the centimetre–gram–second system of units.[1] 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 pascalsecond (Pa⋅s):[2] 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.[3] A centipoise is one hundredth of a poise, or one millipascalsecond (mPa⋅s) in SI units (1 cP = 10−3 Pa⋅s = 1 mPa⋅s).[4] 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).[5] See also[edit] Look up poise in Wiktionary, the free dictionary. Poiseuille Viscosity References[edit] ^ Gooch, Jan W. (2010). Encyclopedia dictionary of polymers (2nd ed.).
Berlin: Springer. ISBN 9781441962461.
^ Reid, Robert C. (1987). The Properties of Gases and Liquids (4th
ed.). McGrawHill.
^ Parker, Sybil P. (1988). Fluid Mechanics Source Book (1st ed.).
McGrawHill.
^ Lide, David R. (1994). CRC Handbook of Thermophysical and
Thermochemical Data (1st ed.). CRC Press.
^ "
Viscosity
