What is the unit of humidity?

The unit of humidity is rh, which means relative humidity, and RH is the abbreviation of relative humidity. Relative humidity refers to the percentage of water vapor pressure and saturated water vapor pressure in the air. The ratio of absolute humidity of wet air to the maximum absolute humidity that can be achieved at the same temperature.

For example, at 90% relative humidity, relative humidity is relative humidity. Humidity in daily life refers to relative humidity, expressed in %RH. In a word, it is the percentage of saturated water vapor (saturated water vapor pressure) of gas (usually air) under the same conditions as its air.

The hygrometer is recording the relative humidity. Relative humidity is the ratio of absolute humidity to maximum humidity, and its value shows how high the saturation of water vapor is. Air with a relative humidity of 100% is saturated air.

The relative humidity is that 50% air contains half of water vapor, reaching the saturation point of air at the same temperature. Water vapor in the air with relative humidity exceeding 100% will generally condense out. With the increase of temperature, the more water can be contained in the air, that is to say, the relative humidity will decrease with the increase of temperature for the same amount of water vapor.

fundamental form

There are three basic forms of humidity, namely water vapor pressure, relative humidity and dew point temperature.

Water vapor pressure (once called absolute humidity) indicates the pressure of water vapor in the air, in hectopascals, with one decimal place reserved;

Relative humidity is expressed as the percentage of the ratio of actual water vapor pressure to saturated water vapor pressure in the air at the current temperature, taking an integer;

Dew point temperature refers to the temperature when the water vapor content in the air and the air pressure reach saturation during cooling. Units are expressed in degrees Celsius (℃), with one decimal place reserved. When equipped with a hygrometer, it can also measure the continuous record of relative humidity and minimum relative humidity.

Refer to the above? Baidu encyclopedia-humidity