-as of [15 JANUARY 2025]-
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( RANG-kin)
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*ABSOLUTE ZERO* —>
“0 RANKINE”
“-459.67° FAHRENHEIT”
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“1 RANKINE” = “-458.67 FAHRENHEIT”
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The Rankine scale is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist Macquorn Rankine, who proposed it in 1859
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Similar to the Kelvin scale, which was first proposed in 1848,[1] zero on the Rankine scale is absolute zero, but a temperature difference of one Rankine degree (°R or °Ra) is defined as equal to one Fahrenheit degree, rather than the Celsius degree used on the Kelvin scale.
In converting from kelvin to degrees Rankine, 1 K = 9/5 °R or 1 K = 1.8 °R. A temperature of 0 K (−273.15 °C; −459.67 °F) is equal to 0 °R.[2]
The Rankine scale is used in engineering systems where heat computations are done using degrees Fahrenheit.[3]
The symbol for degrees Rankine is °R[2] (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). By analogy with the SI unit kelvin, some authors term the unit Rankine, omitting the degree symbol.[4][5]
Some temperatures relating the Rankine scale to other temperature scales are shown in the table below.
Scale
Kelvin Rankine Fahrenheit Celsius Réaumur
Temperature Absolute zero 0 K 0 °Ra −459.67 °F −273.15 °C -218.52 °Ré
Freezing point of brine[a] 255.37 K 459.67 °Ra 0 °F −17.78 °C −14.224 °Ré
Freezing point of water[b] 273.15 K 491.67 °Ra 32 °F 0 °C 0 °Ré
Boiling point of water[c] 373.1339 K 671.64102 °Ra 211.97102 °F 99.9839 °C 79.98712 °Ré
Outline of metrology and measurement
Comparison of temperature scales
^ The freezing point of brine is the zero point of Fahrenheit scale, old definition, see: Grigull 1986
^ The ice point of purified water has been measured to be 0.000089(10) degrees Celsius – see Magnum 1995
^ For Vienna Standard Mean Ocean Water at one standard atmosphere (101.325 kPa) when calibrated solely per the two-point definition of thermodynamic temperature. Older definitions of the Celsius scale once defined the boiling point of water under one standard atmosphere as being precisely 100 °C. However, the current definition results in a boiling point that is actually 16.1 mK less. For more about the actual boiling point of water, see VSMOW in temperature measurement.
^ Jump up to: a b “Rankine”. Merriam-Webster.com Dictionary. Merriam-Webster. Retrieved 2019-11-07.
^ Jump up to: a b B.8 Factors for Units Listed Alphabetically from Thompson & Taylor 2008, pp. 45–69
^ Berger, Eric (2022-08-29). “Warning sign? NASA never finished a fueling test before today’s SLS launch attempt”. Ars Technica.
^ Pauken 2011, p. 20
^ Balmer 2011, p. 10
Balmer, Robert (2011). Modern Engineering Thermodynamics. Oxford: Elsevier Inc. ISBN 978-0-12-374996-3.
Magnum, B.W. (June 1995). “Reproducibility of the Temperature of the Ice Point in Routine Measurements” (PDF). NIST Technical Note. 1411. Archived from the original (PDF) on 2007-03-07. Retrieved 2007-02-11.
Pauken, Michael (2011). Thermodynamics For Dummies. Indianapolis: Wiley Publishing Inc. ISBN 978-1-118-00291-9.
Thompson, Ambler; Taylor, Barry N. (2008). “Guide for the use of the International System of Units (SI)” (PDF). NIST Special Publication. 811. doi:10.6028/nist.sp.811e2008. Retrieved 2019-11-07.
Grigull, Ulrich (1986). Heat Transfer (PDF). Retrieved 2022-08-29.
en.wikipedia.org /wiki/Rankine_scale
Rankine scale
Contributors to Wikimedia projects4-5 minutes 10/24/2001
DOI: 10.6028/nist.sp.811e2008, Show Details
From Wikipedia, the free encyclopedia
This article is about the temperature scale. For the idealized thermodynamic cycle for a steam engine, see Rankine cycle. For the scale measuring recovery after stroke, see Modified Rankin Scale.
Rankine
Unit of Temperature
Symbol R, °R, °Ra
Named after Macquorn Rankine
Conversions
x R in … … corresponds to …
Kelvin scale 5/9 x K
Celsius scale (5/9 x − 273.15) °C
Fahrenheit (x − 459.67) °F
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