Shadow human body senses temperature. China Weather Communication, what does this indicator mean?
Shadow human body perceived temperature refers to the feeling of air temperature when a person is in the shadow.
In summer, the most comfortable temperature for people is 19-24℃, and in winter it is 17-22℃. The human body always maintains a constant body temperature. When the ambient temperature exceeds the upper limit of the comfortable temperature, people will feel hot. If it exceeds 37°C, they will feel extremely hot. Generally, the upper limit of the temperature that people can tolerate is 52°C. On the contrary, when the ambient temperature is lower than the lower limit of comfortable temperature, people feel cool and cold; if it is lower than 0℃, people feel severe cold. For people who generally wear appropriate clothing when engaging in outdoor activities, the lower limit of the temperature they can tolerate is about minus 34°C.
The comfortable temperatures of different parts of the human body are not consistent. Using a skin surface thermometer, the comfortable temperatures of different parts are: head, chest, abdomen, back, and buttocks, 34.6°C; thighs and upper arms, 33.0°C; calves and forearms, 30.8°C; hands and feet, 28.6°C.
Based on the ambient thermometer, the comfortable temperature ranges from 17 to 26.1℃ in summer and from 15.6 to 23.3℃ in winter.
Extended information:
Physiologists believe that around 30°C is the ambient temperature that the human body feels best, and it is also the temperature closest to human skin.
33℃ - Sweat glands start to activate. After working at this temperature for 2-3 hours, the human body's "air conditioner" - sweat glands start to activate, dissipating the accumulated body temperature through slight sweating.
35°C - The heat dissipation function responds immediately. At this time, the superficial veins expand, the skin sweats, the heart beats faster, and the blood circulation accelerates. For some elderly and frail people with poor heat dissipation, they need to cooperate with local cooling or start indoor air conditioning to lower the body temperature.
36°C - Level 1 Alert At this temperature, the human body "self-cools" by evaporating sweat and dissipating heat. Sweat, sodium, vitamins and other minerals are excreted every day, and blood volume is also reduced. . At this time, drinks containing salt, vitamins and minerals should be replenished in time to prevent electrolyte imbalance in the body, and other cooling measures should also be initiated.
38℃——Second level alarm The temperature rises to 38℃. It is no longer possible to maintain a normal body temperature through perspiration from human sweat glands. Not only does the lungs "gasp" rapidly to exhale heat, but even the heart has to speed up to output 60% more blood than usual reaches the body surface to participate in heat dissipation. At this time, cooling measures, cardiac drug care and treatment cannot be relaxed at all.
39℃——Level 3 alarm: Sweat glands are working tirelessly, and there is a risk of heart attack at this time.
Baidu Encyclopedia - Comfort Temperature
Baidu Encyclopedia - Temperature