MAN’S THERMAL BALANCE IN WARM ENCIRONMENTS

摘要

A theoretical analysis of the facters influencing stress in warm and hot environments is developed using physical equations of heat and mosuture transfer. Two different situations are considered, the first where all swear is evaporated and cooling limited by sweat secretion, and the second with the skin wet where cooling is limited by the amount of sweat which can be evaporated. In the former case. Stress is a function of dry-bulb temperature alone and depends on the amount of sweat secreted, which may very considerably among individuals. In the latter cawse, tolerance is shown to be mainly dependent on wet-bulb temperature and depends on the vapor pressure of wet skin, which does not vary much, giving rise to critical lependence of tolerance on wet-bulb temperature.