Convert degrees Rankine to kelvin

Explanation

To convert degrees Rankine to kelvin multiply by 5 and divide by 9.

Formula

°Ra × 5 / 9=K

degrees Rankine°Ra

dimension	temperature
symbol	°Ra
search alias	ra

The degree Rankine (°Ra) is a unit of temperature.

Definition

The zero of the Rankine scale absolute zero and a temperature difference of one degree Rankine is equal to one degree Fahrenheit.

History

The Rankine scale was first proposed in 1859 by Macquorn Rankine, a scottish mechanical engineer. It follows the same logic as the kelvin scale which was suggested in 1848. The only difference between the two is the definition of the steps. The Kelvin scale uses steps in Celsius when the Rankine scale uses steps in Fahrenheit.

kelvinK

dimension	temperature
system	International system of units (SI)
symbol	K

The kelvin (K) is the unit of temperature of the International System of Units.

Definition

It is defined by taking the fixed numerical value of the Boltzmann constant k to be 1.380 649 × 10^–23 when expressed in the unit J K^–1, which is equal to kg m² s^–2 K^–1, where the kilogram, metre and second are defined in terms of h, c and ∆ν_Cs.

From the BIPM: Thermometry: SI base unit

History

The kelvin was first defined in 1954 using the triple point of water to which the temperature 273.16 K was assigned. This definition proved to be impractical and was replaced on 20 May 2019 by the present definition.