Rankine
| Conversion from | to | Formula |
|---|---|---|
| Fahrenheit | Rankine | °Ra = °F + 459.67 |
| Rankine | Fahrenheit | °F = °Ra - 459.67 |
| kelvin | Rankine | °Ra = K × 1.8 |
| Rankine | kelvin | K = °Ra / 1.8 |
| Celsius | Rankine | °Ra = °C × 1.8 + 32 + 459.67 |
| Rankine | Celsius | °C = (°Ra - 32 - 459.67) / 1.8 |
| Réaumur | Rankine | °Ra = °Ré × 2.25 + 32 + 459.67 |
| Rankine | Réaumur | °Ré = (°Ra - 32 - 459.67) / 2.25 |
Rankine is a temperature scale named after Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859. See Rankine-Hugoniot equation.
Like kelvin, Rankine zero is absolute zero, but Fahrenheit degrees are used. As a result, a difference of 1 degree R. is equal to a difference of 1 degree F, but 0 degrees R is -459.67 degrees F.
Other temperature scales include the Newton (c. 1700), Rømer (1701), Fahrenheit (1724), Réaumur (1731), Delisle (or de Lisle) (1738), Celsius (1742), kelvin (1862) and Leyden (c. 1894?). (Note that "kelvin" is lower-cased because it is an SI unit, even though it is named after a person).