Skin temperature has been recognized as a major factor in judging the thermal sensation. Analysing data reported on sweating, whose rate seemed to be represented by skin temperature, provided that the thermal equilibrium had been attained. This paper, first, describes about the results of experiments conducted on thermal sweating of sedentary subjects, in which the linear relationship between the mean skin temperature and sweating rate was confirmed. Applying this relationship into the heat balance equation, a simple equation for predicting the mean skin temperature was introduced as an index of human response to the thermal environment.
