Rankine (°R) to Kelvin (K) Conversion
Rankine
The Rankine scale is an absolute temperature scale using the same degree size as Fahrenheit but with zero at absolute zero (−459.67 °F). It is to Fahrenheit what Kelvin is to Celsius. Used primarily in US aerospace engineering and thermodynamic cycle analysis where Fahrenheit-sized degrees are conventional but absolute temperature values are required. Water freezes at 491.67 °R and boils at 671.67 °R.
Kelvin
The Kelvin is the SI base unit of thermodynamic temperature, named after Lord Kelvin who proposed an absolute temperature scale in 1848. Zero Kelvin (0 K), absolute zero, represents the theoretical lowest possible temperature (−273.15 °C). No degree symbol is used because Kelvin is an absolute scale, not a degree-based one. The Kelvin is universally used in physics and chemistry because it is directly proportional to thermal energy.
| Rankine (°R) | Kelvin (K) |
|---|---|
| 474 °R | 263.33 K |
| 492 °R | 273.33 K |
| 510 °R | 283.33 K |
| 528 °R | 293.33 K |
| 537 °R | 298.33 K |
| 546 °R | 303.33 K |
| 558 °R | 310.00 K |
| 564 °R | 313.33 K |
| 582 °R | 323.33 K |
| 600 °R | 333.33 K |
| 672 °R | 373.33 K |
Frequently Asked Questions (FAQ)
What is the formula to convert Rankine to Kelvin?
The exact formula is K = °R × 5/9. For example: 491.67 °R = 273.15 K and 671.67 °R = 373.15 K. Because both scales start at absolute zero, only the degree-size ratio (5/9) is needed.
What is 540 Rankine in Kelvin?
540 °R equals 300 K. Using the formula: 540 × 5/9 = 300 K, which is approximately 26.85°C or 80.33°F — a warm room temperature.
Convert Rankine (°R) to other units of Temperature
| ‣ Rankine (°R) to Celsius (°C) |
| ‣ Rankine (°R) to Fahrenheit (°F) |
| ‣ Rankine (°R) to Kelvin (K) |
| ‣ Rankine (°R) to Rankine (°R) |
| ‣ Celsius (°C) to Rankine (°R) |
| ‣ Fahrenheit (°F) to Rankine (°R) |
| ‣ Kelvin (K) to Rankine (°R) |
| ‣ Rankine (°R) to Rankine (°R) |