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Absolute temperature scale using Fahrenheit degrees
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.
The Rankine scale ( RANG-kin) is an absolute scale of thermodynamic temperature named after the University of Glasgow engineer and physicist Macquorn Rankine, who proposed it in 1859.[1]
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 °Ra or 1 K = 1.8 °Ra. A temperature of 0 K (−273.15 °C; −459.67 °F) is equal to 0 °Ra.[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] However, historical texts referring to "°R" are much more likely to mean the historically quite common Réaumur scale.[4] 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.[5][6]
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 °RéRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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