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Rankine is a temperature scale that, like kelvin, sets zero at absolute zero, but uses Fahrenheit degrees. It is named after Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859. See Rankine-Hugoniot equation.

A difference of 1 degree R. is equal to a difference of 1 degree F, but absolute zero is 0 degrees R, or -459.67 degrees F. Thus:

Other temperature scales include Fahrenheit (1724), Réaumur (1730), Celsius (1742), and Kelvin (1862).