Cold knowledge: The human body temperature is about 37℃. Why does it feel very hot when the ambient temperature exceeds 30℃?

As we all know, people's body temperature is around 37 degrees, which has been kept in a relatively stable range. Too high or too low will affect the normal operation of human body function. Since people's body temperature is 37 degrees, why do people feel particularly hot when the ambient temperature exceeds 30 degrees?

The comfortable temperature perceived by human body is: summer 19-24℃ and winter 17-22℃. Human activities need energy, which is produced through metabolism. It is impossible to convert all energy into mechanical energy, and neither is the human body. In the process of transformation, part of the chemical energy of food is emitted in the form of heat energy, and naturally there will be body temperature. When the excess body temperature dissipates faster in the process of emission, the human body will feel very cool. If the body temperature dissipates slowly, the heat will gather in the human body and it will feel very hot. Therefore, the human body's perceived comfort is related to the heat dissipation speed (of course, when the ambient temperature is very low, the human body will dissipate heat too quickly and feel cold).

When the ambient temperature exceeds 30 degrees, due to the high external temperature, the human body radiates heat slowly, and the heat accumulated in the human body cannot be discharged in time, which is the reason why the human body feels hotter.

Most of the body's heat is excreted through evaporation and sweat on the body surface. Therefore, when the outside temperature exceeds 30 degrees, the heat of human body can't evaporate with the ambient temperature in the form of convection heat exchange, which affects the heat dissipation efficiency and leads to the slow heat dissipation of human body. Therefore, it is the reason why people feel hotter; In the comfortable temperature range, the heat generated by the human body and heat dissipation form a balance point, and the human body feels more comfortable; When the ambient temperature is low, the heat dissipation is obviously accelerated, and the human body's heat can no longer meet the needs of the body's functions, and there will be a phenomenon of feeling cold. The influence of ambient temperature on human body is mainly that it determines the heat dissipation efficiency (of course, it is also related to the airflow speed).