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Humidity unit and meaning
2012-05-05
 
Humidity in life and production often affects us, so what is the meaning of humidity units?
 
In brief, the percentage of the actual water vapor density in the air and the saturated water vapor density at the same temperature is called the "relative humidity" of the air.
 
The degree of dryness and humidity of the air is related to the degree of saturation of the water vapor contained in the air, and is not directly related to the absolute amount of water vapor contained in the air. For example, when the pressure of water vapor contained in the air is also equal to 1606.24 Pa (12.79 mm Hg), at noon on a hot summer day, the temperature is about 35 ° C, people do not feel wet, so it is far from the saturation pressure of water vapor, objects The water in it can continue to evaporate. In the colder autumn, about 15 °C, people feel wet, because the water vapor pressure has reached supersaturation, and the water can not only evaporate, but also condense into water.
 
Therefore, we call the density ρ1 of the water vapor actually contained in the air and the percentage ρ1/ρ2×100% of the saturated water vapor density ρ2 at the same temperature as the relative humidity. It can also be expressed as the ratio of water vapor pressure.
 
Humidity meter is divided into household type and industrial type. When purchasing, pay attention to the mc mark on the dial, which can be guaranteed to be genuine, such as the following temperature and humidity meter products.



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