Editing Rankine scale (section)

== Usage ==
The Rankine scale is used in engineering systems where heat computations are done using degrees Fahrenheit.<ref name="arstechnica">{{cite web |url=https://arstechnica.com/science/2022/08/warning-sign-nasa-never-finished-a-fueling-test-before-todays-sls-launch-attempt/ |title=Warning sign? NASA never finished a fueling test before today's SLS launch attempt |work=Ars Technica |first=Eric |last=Berger |date=2022-08-29 }}</ref>

The symbol for '''degrees Rankine''' is °R.<ref name="SP811" /> However, historical texts referring to "°R" are much more likely to mean the historically quite common [[Réaumur scale]].<ref>[[Réaumur Scale]]</ref> As there is also the [[Rømer scale]], it is better to use °Ra to be unambiguous. By analogy with the SI unit [[kelvin]], some authors term the unit ''Rankine'', omitting the degree symbol.<ref name="dummies">{{harvnb|Pauken|2011|page=20}}</ref><ref name="engineering">{{harvnb|Balmer|2011|page=10}}</ref> 

Some temperatures relating the Rankine scale to other temperature scales are shown in the table below.
{|class="wikitable" style="text-align:right"
! colspan="2" rowspan="2" |
! colspan="5" |Scale
|-
! scope="col" | Kelvin
! scope="col" | Rankine
! scope="col" | Fahrenheit
! scope="col" | Celsius
! scope="col" | Réaumur
|-
! rowspan="4" |Temperature
! scope="row" | [[Absolute zero]]
| 0&nbsp;K
| 0&nbsp;°Ra
| −459.67&nbsp;°F
| −273.15&nbsp;°C
| −218.52&nbsp;°Ré
|-
! scope="row" | Freezing point of [[brine]]{{efn|The freezing point of [[brine]] is the zero point of Fahrenheit scale, old definition, see: {{harvnb|Grigull|1986}}}}
| 255.37&nbsp;K
| 459.67&nbsp;°Ra
| 0&nbsp;°F
| −17.78&nbsp;°C
| −14.224&nbsp;°Ré
|-
! scope="row" | Freezing point of water{{efn|The ice point of purified water has been measured to be 0.000089(10) degrees Celsius – see {{harvnb|Magnum|1995}}}}
| 273.15&nbsp;K
| 491.67&nbsp;°Ra
| 32&nbsp;°F
| 0&nbsp;°C
| 0&nbsp;°Ré
|-
! scope="row" | [[Boiling point]] of water{{efn|For [[Vienna Standard Mean Ocean Water]] at one [[Atmosphere (unit)|standard atmosphere]] (101.325&nbsp;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]].}}
| 373.1339&nbsp;K
| 671.64102&nbsp;°Ra
| 211.97102&nbsp;°F
| [[Celsius#Melting and boiling points of water|99.9839&nbsp;°C]]
| 79.98712&nbsp;°Ré
|}