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{{dablink|For the idealized thermodynamic cycle for a steam engine, see [[Rankine cycle]]. For the scale measuring recovery after stroke, see [[modified Rankin scale]].}}
{{temperature}}
'''Rankine''' is a [[thermodynamic temperature|thermodynamic (absolute) temperature]] scale named after the [[Scotland|Scottish]] [[engineer]] and [[physicist]] [[William John Macquorn Rankine]], who proposed it in [[1859]].

The symbol is '''R''' (or '''Ra''' if necessary to distinguish it from the [[Rømer scale|Rømer]] and [[Réaumur scale|Réaumur]] scales). As with the [[Kelvin|Kelvin scale]] (symbol:&nbsp;K), zero on the Rankine scale is [[absolute zero]], but the Rankine degree is defined as equal to one degree [[Fahrenheit]], rather than the one degree [[Celsius]] used by the Kelvin scale. A temperature of -459.67 °F is exactly equal to 0 R. 

A few engineering fields in the [[United States|U.S.]] measure thermodynamic temperature using the Rankine scale. However, throughout the scientific world where measurements are made in [[International System of Units|SI]] units, thermodynamic temperature is measured in kelvin.

{{-}}
Some key temperatures relating the Rankine scale to other temperature scales are shown in the table below.

{| class="wikitable"
|-
|
! Kelvin
! Celsius
! Fahrenheit
! Rankine
|-
! Absolute zero<br>(by definition)
|align="center"|0 K
|align="center"|−273.15 °C
|align="center"|−459.67 °F
|align="center"|0 R
|-
! Freezing point of water<ref>The ice point of purified water has been measured to be 0.000089(10) degrees Celsius - see {{cite journal | last = Magnum | first = B.W. | year = 1995 | month = June
 | title = Reproducibility of the Temperature of the Ice Point in Routine Measurements
 | journal = Nist Technical Note | volume = 1411 
 | url = http://www.cstl.nist.gov/div836/836.05/papers/magnum95icept.pdf
 | format = PDF | accessdate = 2007-02-11 }} 
</ref> 
|align="center"|273.15 K
|align="center"|0 °C
|align="center"|32 °F
|align="center"|491.67 R
|-
! [[Triple point]] of water<br>(by definition)
|align="center"|273.16 K
|align="center"|0.01 °C
|align="center"|32.018 °F
|align="center"|491.688 R
|-
! [[Boiling point]] of water<ref>For [[Vienna Standard Mean Ocean Water]] at one [[Atmosphere (unit)|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&nbsp;°C. However, the current definition results in a boiling point that is actually 16.1&nbsp;mK less. For more about the actual boiling point of water, see [[Vienna Standard Mean Ocean Water#VSMOW in temperature measurement|VSMOW in temperature measurement]].</ref>
|align="center"|373.1339 K
|align="center"|[[Celsius#The melting and boiling points of water|99.9839 °C]]
|align="center"|211.9710 °F
|align="center"|671.641 R
|}
{{Measurement-stub}}
==References==
{{reflist|2}}

==See also==
{{wiktionarypar|degree Rankine}}
* [[Comparison of temperature scales]]
* [[Rankine-Hugoniot equation]]

{{TemperatureScales}}

[[Category:Units of temperature]]

[[ca:Grau Rankine]]
[[cs:Stupeň Rankina]]
[[da:Rankine]]
[[de:Rankine-Skala]]
[[et:Rankine'i skaala]]
[[es:Rankine]]
[[eu:Rankine]]
[[fa:رانکین]]
[[fr:Échelle Rankine]]
[[ko:란씨]]
[[he:מעלות רנקין]]
[[id:Skala Rankine]]
[[it:Rankine]]
[[nl:Rankine]]
[[ja:ランキン度]]
[[no:Rankine]]
[[pl:Skala Rankine'a]]
[[pt:Rankine]]
[[ru:Градус Ранкина]]
[[simple:Rankine scale]]
[[sk:Stupeň Rankina]]
[[sv:Rankine]]