The evaporation of the sweat is actually what cools you. The change from a liquid to a gas requires heat energy and it gets part of that heat energy from the skin, making the body feel cooler.
Perspiration takes excess heat from your body and releases it to the surface in moisture. A secondary mechanism continues to cool the body as the moisture evaporates from the surface of the skin. Cooling occurs in all types of climates but the evaporation mechanism works best in areas with low humidity because it exchange is more rapid.
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well, during exercise, you tend to perspirate (sweat) and this will help you to loose the excess skin and weight that you know longer want. sweat usually turns up when you do a type of cardio respiratory endurance or intense workout. Sweat is good, it tells you that you are working yourself hard and improving your fitness.
from Chris Milne, 16, Aberdeen, Scotland (aspiring personal trainer)
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it releases a water like substance all over your body so that air can run against it and make it cold, therefore cooling your whole body.
It is the evaporation of the perspiration from your skin.
For evaporation to take place energy is required, this is taken from the skin.