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How is the relative humidity calculated?
There are two formulas for calculating relative humidity, as shown below:

1, the actual water vapor density per unit volume of air d 1 and the percentage of saturated water vapor density d2 at the same temperature, that is, RH = d1/d2x100%;

2. The actual air vapor pressure p 1 is the percentage of the saturated vapor pressure p2 at the same temperature, that is, RH= p 1/ p2 x 100%.

Extended data:

Application of relative humidity:

1, to prevent colds:

(1) Low relative humidity accelerates the reproduction of influenza virus and pathogenic Gram-positive bacteria, and spreads with dust, resulting in disease epidemic;

(2) Low relative humidity can reduce the resistance of human respiratory system and induce and aggravate respiratory diseases.

2. Protect the collection of paintings and calligraphy:

(1) When the relative humidity is lower than 65%, mold cannot develop normally.

(2) If the relative humidity drops below 45% for a long time, the paper will become brittle due to drying, resulting in physical decay. Therefore, maintaining the lower limit of relative humidity of 50% is a strict requirement for the preservation of calligraphy and painting.

Baidu encyclopedia-relative humidity