The Celsius temperature scale is an interval scale [0] which means that it is possible to calculate differences but not ratios. The Kelvin temperature scale is

The Celsius temperature scale is an interval scale [0] which means that it is possible to calculate differences but not ratios. The Kelvin temperature scale is a ratio scale [0] (it has an "absolute zero") that allows to do that. Beside that if there are uncertainties involved, one should do proper propagation of uncertainty anyways. [1] [0] https://en.wikipedia.org/wiki/Level_of_measurement https://en.wikipedia.org/wiki/Level_of_measurement [1] https://en.wikipedia.org/wiki/Propagation_of_uncertainty https://en.wikipedia.org/wiki/Propagation_of_uncertainty