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# Rankine scale

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The **Rankine scale** is a thermodynamic (absolute) temperature scale. It is based around absolute zero. Rankine is similar to the Kelvin scale in that it starts at absolute zero and 0*°Ra* is the same as 0*K* but is different as a change of 1*°Ra* is the same as a change of 1*°F* (Fahrenheit) and not 1*°C* (Celsius). Note that the abbreviation *°R* is ambiguous, as it can also refer to the Réaumur scale.

The Kelvin and Rankine temperature scales are defined so that absolute zero is 0 kelvins (K) or 0 degrees Rankine (°R). The Celsius and Fahrenheit scales are defined so that absolute zero is −273.15 °C or −459.67 °F.

The Rankine scale was originally used in the United States.