Question

why does evaporation causes cooling

Answer 1

Each molecule in the liquid phase is attracted to the other molecules in the liquid. When a molecule changes phase ( evaporates) it has to break all those intermolecular forces so it can escape. Only the molecules that have sufficient kinetic energy can do this. These high energy molecules leave to the gas phase and the remaining molecules are the ones that did not have enough energy to evaporate. This, the average kinetic energy of the molecules in the liquid left behind is lower that it was before the hot ones leave. So, evaporation “cools” what is left behind because the heat was used up breaking the hotter molecules out into the gas phase.

On a hot day you sweat. That sweat evaporates and carries away heat. Your body gave that heat to the sweat ( water) so your body cooled off. This is important as a means by which your body can avoid overheating.

Answer 2

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• The process of changing liquid into gas both below and at the boiling temperature is called Evaporation. Evaporation gain heat from the surrounding as a result there is a loss of heat in the surrounding the cooling process start and the surface become cool. This is the reason why evaporation produce cooling.