The measuring principle of the hygrometer
In the measurement method, humidity is defined as the "quantity of the physical state". The humidity referred to in daily life is relative humidity, expressed in RH%. In short, it is the percentage of saturated water vapor (saturated water vapor pressure) in a gas (usually air) that contains the same amount of water vapor (water vapor pressure) as its air.
Humidity has been closely related to life for a long time, but it is difficult to express it in quantity. There are absolute humidity, relative humidity, dew point, the ratio of moisture to dry gas (weight or volume) and so on.
