Final answer:
Evaporation is the process of heat loss by the skin when water (sweat) evaporates, absorbing heat energy. This helps in cooling the body during exercise or in hot weather.
Step-by-step explanation:
The process of heat loss by the skin through the absorption of heat by water (sweat) vaporization is known as evaporation.
Evaporation occurs when water molecules change from a liquid to a gas and this process requires a significant amount of energy. When sweat evaporates from the skin, it takes away heat energy from the body, which helps in cooling the body during exercise or in hot weather.