To survive, it must get rid of the excess heat. Conduction - the transfer of heat from a warm object to a cool one that is touching it. Convection - the transfer of heat by circulation or movement of air. Radiation - the transfer of heat by electromagnetic waves. Evaporation - the transfer of heat by changing a liquid into a gas.
Heat moves from warm to cool areas.
During exercise, when the body is extremely warm, heat can be lost by a combination of the four methods. Sweating, however, is the body's most important means for heat loss, especially during exercise. Any condition that slows or blocks the transfer of heat from the body by evaporation causes heat storage which results in an increase in body temperature. When the relative humidity is 100 percent, the air is completely saturated at its temperature. No more water can evaporate into the surrounding air.