People may have such feelings: In the hot summer days, when the temperature rises to a certain extent, it seems that it is surrounded by a kind of uncomfortable sultry, it is physically and mentally exhausted and it gets twice the result with half the effort. Most people blame the temperature. It is not only the temperature that affects our physical and mental health and work efficiency, but also the humidity that has not caused people to know enough about it.

The so-called humidity is the scale of the moisture contained in the air. Comparing the moisture contained in a certain temperature with the moisture that it can store, is the relative humidity that represents the moisture content of the air. One important reason why summer heat is difficult is that temperature and humidity increase at the same time. Surveys have shown that when the relative humidity reaches 90% at 28°C, you have the feeling that the temperature reaches 34°C. This is because when the humidity is high, the content of water vapor in the air is high and the amount of evaporation is small. It is difficult for the body to excrete a large amount of sweat to evaporate, and the body's heat can not be swiftly distributed, so it will feel stuffy.

According to statistics, when the relative humidity reaches 30%, the temperature of heatstroke is 40°C. At 50%, the temperature of heat stroke is 38°C. When the relative humidity reaches 80%, it also causes sunstroke at 31°C. If winter encounters low temperatures and high humidity, people will feel cold and damp. The rain in autumn, low air pressure, high humidity, can affect people's blood pressure, blood sediment, urine output, etc., making some people appear depressed, depressed mood.