The secretion of sweat does not cool the body when it exits, but only when it evaporates. Evaporation of sweat from the body is influenced by three factors: temperature, humidity of the air and wind.
1. High environmental temperature increases the evaporation of water from the body.
2. Air humidity - quantity in the air - also affects evaporation: when the air is saturated with water vapor, which contains all the amount of water vapor possible, can not absorb another amount of water vapor, so no evaporation occurs. When air humidity is less, evaporation can occur.
Wind The air is saturated with water vapor from the body, so air near the body is less humid and evaporation increases. In humans - the combination of these three factors determines the frequency of evaporation of sweat and the frequency of cooling the body, ie the heat load.
1. High environmental temperature increases the evaporation of water from the body.
2. Air humidity - quantity in the air - also affects evaporation: when the air is saturated with water vapor, which contains all the amount of water vapor possible, can not absorb another amount of water vapor, so no evaporation occurs. When air humidity is less, evaporation can occur.
Wind The air is saturated with water vapor from the body, so air near the body is less humid and evaporation increases. In humans - the combination of these three factors determines the frequency of evaporation of sweat and the frequency of cooling the body, ie the heat load.