What is the concept of humidity value? What do you mean by percentage? What is the suitable humidity range for human survival?

The percentage value of the actual water vapor density contained in the air and the saturated water vapor density at the same temperature is called the "relative humidity" of the air.

The most pleasant indoor temperature and humidity is: (people who feel comfortable in this range account for more than 95%)

In winter, the temperature is 20 to 25℃ and the relative humidity is 30% to 80%.

In summer, the temperature is 23 to 30℃ and the relative humidity is 30% to 60%.

In an air-conditioned room, people will feel most comfortable when the room temperature is 20-25℃ and the humidity is 40-50%.

High efficiency room temperature: 20℃, relative humidity 40% ~ 60%. At this time, people have a good mental state and the most agile thinking.

Extended data:

First, the calculation method

Relative humidity is the percentage of the actual water vapor density in air per unit volume (expressed by d 1) and the saturated water vapor density at the same temperature (expressed by d2), that is, RH (%) = d1/d2x100%; Another calculation method is: the percentage of actual air vapor pressure (expressed by p 1) and saturated vapor pressure (expressed by p2) at the same temperature, that is, RH(%)= p 1/ p2 x 100%.

Second, the proper values in daily life.

In summer, the indoor relative humidity is too high, which will inhibit the heat dissipation of the human body and make people feel very stuffy and irritable. When the indoor relative humidity is high in winter, it will accelerate heat conduction and make people feel cold and depressed.

When the indoor relative humidity is too low, people will feel thirsty, dry tongue, even sore throat, hoarse voice and nosebleeds. And it is easy to catch a cold because of the large loss of water in the upper respiratory mucosa. Therefore, experts believe that the upper limit of relative humidity should not exceed 80% and the lower limit should not be lower than 30%.

However, people's somatosensory perception is not simply affected by temperature or relative humidity, but the result of its comprehensive action. According to the experimental results, the most comfortable indoor temperature and humidity are: the winter temperature is 20 ~ 25℃ and the relative humidity is 30% ~ 80%; In summer, the temperature is 23 to 30℃ and the relative humidity is 30% to 60%.

More than 95% people feel comfortable in this range. In an air-conditioned room, people will feel most comfortable when the room temperature is 20-25℃ and the humidity is 40-50%.

Baidu encyclopedia-relative humidity