Rankine scale
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The Rankine scale (Template:IPAc-en Template:Respell) is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist Macquorn Rankine, who proposed it in 1859.<ref name="Merriam-Webster"/>
HistoryEdit
Similar to the Kelvin scale, which was first proposed in 1848,<ref name="Merriam-Webster">Template:Cite Merriam-Webster</ref> 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 = Template:Sfrac °Ra or 1 K = 1.8 °Ra. A temperature of 0 K (−273.15 °C; −459.67 °F) is equal to 0 °Ra.<ref name="SP811">B.8 Factors for Units Listed Alphabetically from Template:Harvnb</ref>
UsageEdit
The Rankine scale is used in engineering systems where heat computations are done using degrees Fahrenheit.<ref name="arstechnica">{{#invoke:citation/CS1|citation |CitationClass=web }}</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">Template:Harvnb</ref><ref name="engineering">Template:Harvnb</ref>
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 brineTemplate:Efn | 255.37 K | 459.67 °Ra | 0 °F | −17.78 °C | −14.224 °Ré | |
| Freezing point of waterTemplate:Efn | 273.15 K | 491.67 °Ra | 32 °F | 0 °C | 0 °Ré | |
| Boiling point of waterTemplate:Efn | 373.1339 K | 671.64102 °Ra | 211.97102 °F | 99.9839 °C | 79.98712 °Ré | |
See alsoEdit
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BibliographyEdit
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External linksEdit
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