Full name: degree Rankine
Plural form: degrees Rankine
Alternate spelling: R
Category type: temperature
Scale factor: 0.55555555555556
The SI base unit for temperature is the kelvin.
1 kelvin is equal to 1.8 Rankine.
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Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859.
The symbol is °R (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). As with the Kelvin scale (symbol: K), zero on the Rankine scale is absolute zero. The Rankine scale differs from the Kelvin scale in that it uses smaller, degree Fahrenheit-size increments rather than degree Celsius-size increments. A temperature of 459.67 °R is precisely equal to and 0 °F.
Many engineering fields in the U.S. measure thermodynamic temperature using the Rankine scale. However, throughout the scientific world where measurements are made in SI units, thermodynamic temperature is measured in kelvins.