Don't downvote that - it's correct: the Celsius scale is an "interval scale" while the Kelvin scale is a "ratio scale". One must not take ratios of Celsius valu

Don't downvote that - it's correct: the Celsius scale is an "interval scale" while the Kelvin scale is a "ratio scale". One must not take ratios of Celsius values as ratios are not even defined for that. https://en.wikipedia.org/wiki/Level_of_measurement https://en.wikipedia.org/wiki/Level_of_measurement