5.12 describe the Kelvin scale of temperature and be able to convert between Kelvin and Celsius scales

Absolute 0, -273ºC, is the start of the Kelvin temperature scale (basically, 0K is -273ºC). The two temperature scales (ºC and K) have the same temperature change (e.g. a change of 12ºC is also a change of 12K) which is handy as it means conversion is super simple.

In order to convert from K to ºC all you need to do is -273 (and change the unit from K to ºC). Alternatively, to convert from ºC to K just ass 273. For example..


0K = -273ºC
0ºC = 273K
100ºC = 373K

NOTE: there is a little more information on Kelvin and absolute 0 (-273ºC) in post 5.11