Definition: Celsius is a scale and unit of measurement for temperature where 0 °C is the freezing point of water and 100 °C is the boiling point at standard atmospheric pressure.
History/origin: Developed by Anders Celsius in 1742.
Current use: Widely used around the world for everyday temperature measurements.
Definition: Kelvin is the SI base unit of temperature, starting at absolute zero (0 K), where all thermal motion ceases.
History/origin: Developed by William Thomson, Lord Kelvin.
Current use: Used primarily in scientific contexts to measure thermodynamic temperature.
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 | 0 |
| 0 | 273.15 |
| 25 | 298.15 |
| 100 | 373.15 |
| 500 | 773.15 |
Formula: Kelvin = Celsius + 273.15
Example: convert 25 °C to K:
25 + 273.15 = 298.15 K