Temperature
Convert degree Rankine (°R) to degree Fahrenheit (°F). Temperature scales are affine, not just scaled — converting requires an offset as well as a factor, which is why °C and °F don't share a zero.
1 °R = -458.67 °F
To convert degree Rankine to degree Fahrenheit, apply °F = °R − 459.67.
| °R | °F |
|---|---|
| 1 | -458.67 |
| 2 | -457.67 |
| 5 | -454.67 |
| 10 | -449.67 |
| 25 | -434.67 |
| 50 | -409.67 |
| 100 | -359.67 |
| 250 | -209.67 |
| 500 | 40.33 |
| 1000 | 540.33 |
Process temperatures are read in °C or °F; thermodynamic calculations use absolute K or °R.
A temperature difference is not the same as an absolute temperature: a 10 °C rise equals an 18 °F rise, but 10 °C does not equal 50 °F.
Worked example. A temperature of 761.67 °R is 302 °F.
Use °F = °R − 459.67. Temperature scales are affine, so the conversion needs both a multiplier and an offset — unlike a simple unit factor.
1 °R equals -458.67 °F. Note that a temperature difference converts differently from an absolute temperature.
Process temperatures are read in °C or °F; thermodynamic calculations use absolute K or °R.