Question

In the determination of boiling of water, it is advised to put the bulb of the thermometer above water rather than in water. Why?

Answer 1

It is advised to put the bulb of the thermometer above the water rather than in water to make sure that the boiling point (the boiling point of a pure substance is the temperature at which the substance transits from a liquid to the gaseous phase ) obtained is accurate even when the water sample contains non-volatile impurities dissolved because non-volatile impurities will not vaporize.