“Poise (unit)”的意思、由来-开放百科全书

The poise (symbol P; {{IPAc-en|p|ɔɪ|z|,_|p|w|ɑː|z}}) 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).

The analogous unit in the International System of Units is the pascal-second (Pa⋅s):^[2]

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

References

1. ^{{cite book|last1=Gooch|first1=Jan W.|title=Encyclopedia dictionary of polymers.|date=2010|publisher=Springer|location=Berlin|isbn=978-1-4419-6246-1|edition=2nd}}
2. ^{{cite book|last1=Reid|first1=Robert C.|title=The Properties of Gases and Liquids.|date=1987|publisher=McGraw-Hill|edition=4th}}
3. ^{{cite book|last1=Parker|first1=Sybil P.|title=Fluid Mechanics Source Book.|date=1988|publisher=McGraw-Hill|edition=1st}}
4. ^{{cite book|last1=Lide|first1=David R.|title=CRC Handbook of Thermophysical and Thermochemical Data.|date=1994|publisher=CRC Press|edition=1st}}
5. ^"Viscosity of Liquids", in CRC Handbook of Chemistry and Physics, 91st Edition, W.M. Haynes, ed., CRC Press/Taylor and Francis, Boca Raton, Florida, 2010-2011.