- degree Rankine
- (°R)a traditional unit of absolute temperature. 1 degree Rankine represents the same temperature difference as 1 degree Fahrenheit, but the zero point of the scale is set at absolute zero. This means the Rankine temperature is 459.67° plus the Fahrenheit temperature. 1 degree Rankine is equal to exactly 5/9 kelvin. The unit is named for the British physicist and engineer William Rankine (1820-1872).
Dictionary of units of measurement. 2015.