|The Celsius scale is based on the behaviour of water. The kelvin temperature scale is based on the behaviour of all matter. The first time we see the kelvin temperature scale in action is in the gas laws (page 14). |
From experiments on gases, we can deduce that the pressure due to an ideal gas would go to zero at 273 °C. Also, the volume would go to zero at 273 °C. We can say, therefore, that particles would stop moving at this temperature and we refer to this temperature as absolute zero or 0 K (zero K).
Absolute zero (0 K) is equivalent to 273 °C. Each degree on the absolute temperature scale is the same as a degree on the Celsius scale. So ice melts at +273 K and water boils at +373 K. To get from a Celsius value to a kelvin value, we simply add 273.
|Picture 2.7 Absolute temperature scale.|