All about air

摘要

Compressed air may be partially dehumidified or dehydrated by several methods. The compressor is seldom given credit for removing the bulk or the moisture in compressed air. The weatherman might say that the "relative humidity" of the (ambient) air is 50% when the atmospheric air is holding one half of the moisture that it could before saturation. "Dew point" is the term commonly used to identify the saturation temperature. When dew point is given for pressures above atmospheric the pressure should be specified.