Question

If the hotness or coldness of a body is relative how do we measure its degree of hotness ?

Answer 1

Make sure the relative importance, of the measuring device’s, are maximal relative to their containers. For example a temperature probe may have a shield around it which takes a long time to get warmer or hotter and the sensor might be in only part of the shield and parts of the shield might be in places with different temperatures — like a Mercury of Alcohol thermometer where the glass tube as to be all in the place of measurement and for long enough for the insides to equal the glass so time has to pass for the differences to be equal between the insides of the thermometer and the whole length.