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Rankine is a temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859. See Rankine-Hugoniot equation.
The symbol is usually given as °R, but since this may lead to confusion with the Rømer or Réaumur scales, °Ra is to be preferred. Like kelvin, Rankine zero is absolute zero, but Fahrenheit degrees are used. As a result, a difference of 1°Ra is equal to a difference of 1°F, but 0°Ra is -459.67°F.
| Temperature scales |
| kelvin | Celsius | Fahrenheit |
| Disused scales |
| Delisle | Leyden | Newton | Rankine | Réaumur | Rømer |
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