Temperature
Convert degree Rankine (°R) to degree Celsius (°C). 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 = -272.5944 °C
To convert degree Rankine to degree Celsius, apply °C = °R × 0.5555556 − 273.15.
| °R | °C |
|---|---|
| 1 | -272.5944 |
| 2 | -272.0389 |
| 5 | -270.3722 |
| 10 | -267.5944 |
| 25 | -259.2611 |
| 50 | -245.3722 |
| 100 | -217.5944 |
| 250 | -134.2611 |
| 500 | 4.627778 |
| 1000 | 282.4056 |
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 150 °C.
Use °C = °R × 0.5555556 − 273.15. Temperature scales are affine, so the conversion needs both a multiplier and an offset — unlike a simple unit factor.
1 °R equals -272.5944 °C. 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.