In the study of human bioclimatology, one of several parameters devised to measure the cooling effect of the air upon a human body. Essentially, cooling power is determined by the amount of applied heat required by a device to maintain it at a constant temperature (usually 34°C); the entire system should be made to correspond, as closely as possible, to the external heat exchange mechanism of the human body. Instruments used in applying this principle include the katathermometer, the frigorimeter, and the coolometer. Compare cooling temperature, operative temperature.