Sweat on the surface of skin works as a cooling system because the liquid water absorbs heat from the skin surface and is transferred to the air when the water evaporates.
Why does sweating have a cooling effect?
The cooling effect on a body via sweating depends on a principle of physics known to be "heat of vaporization."
This is where it uses energy to evaporate sweat off of your skin and excess body heat is used to convert sweat into vapor and a person start to cool down.
Therefore, Sweat on the surface of skin works as a cooling system because the liquid water absorbs heat from the skin surface and is transferred to the air when the water evaporates.
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