A temperature is a numerical measure of hot and cold. Its measurement is by detection of heat radiation, particle velocity, kinetic energy, or most commonly, by the bulk behavior of a thermometric material. It may be calibrated in any of various temperature scales, Celsius, Fahrenheit, Kelvin, etc.
| from Kelvin | to Kelvin | |
|---|---|---|
| Celsius | [°C] = [K] - 273.15 | [K] = [°C] + 273.15 |
| Fahrenheit | [°F] = [K] × 9/5 - 459.67 | [K] = ([°F] + 459.67) × 5/9 |
| Rankine | [°R] = [K] × 9/5 | [K] = [°R] × 5/9 |
| Delisle | [°De] = (373.15 - [K]) × 3/2 | [K] = 373.15 - [°De] × 2/3 |
| Newton | [°N] = ([K] - 273.15) × 33/100 | [K] = [°N] × 100/33 + 273.15 |
| Réaumur | [°Ré] = ([K] - 273.15) × 4/5 | [K] = [°Ré] × 5/4 + 273.15 |
| Romer | [°Ro] = ([K] - 273.15) × 21/40 + 7.5 | [K] = ([°Ro] - 7.5) × 40/21 + 273.15 |