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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 pascal-second (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 millipascal-second (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 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

.