Refrigerating from Evaporation

Sweat on the body evaporated and cools the body. Water stored in porous container is cooled in the heat of the day. Water seeps from the inside. There is a small amount of water on the outer surface. The surface of the water evaporates it evaporates.

A large part of the heat required to evaporate comes from the liquid in the container. When the heat is so liquid cooled. The heat is carried away with the steam.