We all must have experienced having a cold feeling on our skin. For example, when we sweat and exposed to wind gusts or when we put a liquid such as alcohol to our skin. This happens because the feeling of cold water or alcohol is taking heat for the skin around the evaporation process and make it turn into a gas.
If we express this in another way, namely applying heat to an object separately directed into the form of hot gas then we point to make the gas can be referred to as the latent heat of evaporation.
With the principle of evaporation that occurs when liquid water is exactly the process of making the heat we need a liquid that will continually evaporate if we want around us absorbed heat. However, if the substance is always evaporate, then it is not economical. So they invented a system that can circulate liquid to gas and the evaporation of the results into a liquid then the liquid will evaporate and take the heat as an energy source for evaporation.
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