Poise (unit): Difference between revisions
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The '''poise''' (symbol P; {{IPAc-en|lang|ˈ|p|ɔɪ|z|,|ˈ|p|w|ɑː|z}}) is the unit of [[Viscosity#Dynamic viscosity|dynamic viscosity]] in the [[centimetre–gram–second system of units]].<ref>{{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}}</ref> It is named after [[Jean Léonard Marie Poiseuille]]. |
The '''poise''' (symbol P; {{IPAc-en|lang|ˈ|p|ɔɪ|z|,|ˈ|p|w|ɑː|z}}) is the unit of [[Viscosity#Dynamic viscosity|dynamic viscosity]] (absolute viscosity) in the [[centimetre–gram–second system of units]].<ref>{{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}}</ref> It is named after [[Jean Léonard Marie Poiseuille]]. |
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:<math>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}.</math> |
:<math>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}.</math> |
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:<math>1~\text{Pa} \cdot \text{s} = 1~\text{kg} \cdot \text{m}^{-1} \cdot \text{s}^{-1} = 10~\text{P}.</math> |
:<math>1~\text{Pa} \cdot \text{s} = 1~\text{kg} \cdot \text{m}^{-1} \cdot \text{s}^{-1} = 10~\text{P}.</math> |
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The poise is often used with the [[metric prefix]]<!--NB: not an SI prefix here--> ''centi-'' because the viscosity of water at 20 °C is almost exactly 1 centipoise. A '''centipoise''' is one hundredth of a poise, equal to one millipascal-second (mPa·s) in SI units (1 cP = 10<sup>−3</sup> Pa·s = 1 mPa·s). |
The poise is often used with the [[metric prefix]]<!--NB: not an SI prefix here--> ''centi-'' because the viscosity of water at 20 °C is almost exactly 1 centipoise.<ref>{{cite book|last1=Parker|first1=Sybil P.|title=Fluid Mechanics Source Book.|date=1988|publisher=McGraw-Hill|edition=1st}}</ref> A '''centipoise''' is one hundredth of a poise, equal to one millipascal-second (mPa·s) in SI units (1 cP = 10<sup>−3</sup> Pa·s = 1 mPa·s). |
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The CGS symbol for the centipoise is cP. The abbreviations cps, cp, and cPs are sometimes seen. |
The CGS symbol for the centipoise is cP. The abbreviations cps, cp, and cPs are sometimes seen. |
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Revision as of 21:31, 7 August 2017
 | This article needs additional citations for verification. (December 2009) |
The poise (symbol P; English: /ˈpɔɪzˌˈpwɑːz/) 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.
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 is almost exactly 1 centipoise.[3] A centipoise is one hundredth of a poise, equal to 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.
Water has a viscosity of 0.00899 poises at 25 °C and a pressure of 1 atmosphere (0.00899 P = 0.899cP = 0.899 mPa·s).[4]
See also
Look up poise in Wiktionary, the free dictionary.
References
- ^ 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.
- ^ "Viscosity of Liquids", in CRC Handbook of Chemistry and Physics, 89th Edition (Internet Version 2009), David R. Lide, ed., CRC Press/Taylor and Francis, Boca Raton, FL.