When water evapotates from the surface of something, that surface becomes much cooler because it require heat to change theh liquid into a vapor. You may have wondered why youfeel cooler by the ocean or a river. It is because of natural evaporation.And also when you come out of a swimming pool, a breeze blows across your body. The chilling effect is caused by the evaporation process of the wate drying quickly from the body. When 1ℓ(1kg)water evaporates,that water will be take about 586kcal of the heat into air.