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 Celsius | to Celsius | |
|---|---|---|
| Fahrenheit | [°F] = [°C] × 9/5 + 32 | [°C] = ([°F] - 32) × 5/9 |
| Kelvin | [K] = [°C] + 273.15 | [°C] = [K] - 273.15 |
| Rankine | [°R] = ([°C] + 273.15) × 9/5 | [°C] = ([°R] - 491.67) × 5/9 |
| Delisle | [°De] = (100 - [°C]) × 3/2 | [°C] = 100 - [°De] × 2/3 |
| Newton | [°N] = [°C] × 33/100 | [°C] = [°N] × 100/33 |
| Réaumur | [°Ré] = [°C] × 4/5 | [°C] = [°Ré] × 5/4 |
| Romer | [°Ro] = [°C] × 21/40 + 7.5 | [°C] = ([°Ro] - 7.5) × 40/21 |