What sweat
Sweat glands
What Sweat Does

     The maximum volume of sweat that a person who is not adapted to hot climates can produce is about one liter per hour. If you move to a hot climate like the tropics, your ability to sweat in about six weeks! When sweat evaporates from the surface of your skin, it removes excess skin  and cools you down. This is due to a neat principle in physics, which goes like this. To convert water from liquid to vapor , it takes a certain amount of heat called the heat of vaporization. This heat energy increases the speed of the water molecules so that they can escape into the air. All of toe sweat does not evaporate but burns off of your skin. not all heat energy is lost through sweat.
     When the water in sweat evaporates ,it leaves sodium, chloride and potassium behind your skin. This is why your skin tastes salty. The loss of salt and water from your body can dehydrate you quickly. This can lead to circulatory problems, kidney failure, and heat stroke. It is important to drink plenty of fluids when you exercise. sports drinks contain some salts to replace those lost in sweat.