The humid air is cooled under equal pressure, so that the unsaturated water vapor originally contained in the air becomes the temperature of saturated steam, or when the temperature of the air is lowered to a certain temperature, the unsaturated water vapor originally contained in the air is Saturated (ie, water vapor begins to liquefy and liquid condenses out), which is the dew point temperature of the gas.
The pressure dew point means that the gas with a certain pressure is cooled to a certain temperature, and the unsaturated water vapor contained therein becomes saturated steam, and this temperature is the pressure dew point of the gas.
The atmospheric dew point refers to the temperature at which the gas is cooled to a level at which atmospheric water vapor is saturated at a standard atmospheric pressure.
In the air compressor industry, the dew point indicates the degree of dryness of the gas.