Does 90% relative humidity mean that 90% of the air is water?

90% relative humidity does not mean that 90% of the air is water. Relative humidity refers to the percentage of water vapor pressure in the air to saturated water vapor pressure at the same temperature. Or the ratio of the absolute humidity of wet air to the maximum absolute humidity that can be achieved at the same temperature. It can also be expressed as the ratio of the partial pressure of water vapor in wet air to the saturated pressure of water at the same temperature.

Living in this environment will make people feel uncomfortable. Experts believe that the upper limit of relative humidity should not exceed 80% and the lower limit should not be less than 30%. People's body feeling is not simply affected by temperature or relative humidity, but the result of their joint action.

Extended data

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%.

Considering the influence of temperature and relative humidity on people's thinking activities, the most suitable indoor temperature should be high working efficiency. At 20℃, the relative humidity should be 40% to 60%. At this time, people's mental state is very good and their thinking is the most agile.

Baidu encyclopedia-relative humidity