G1849 Air Properties: Temperature and Relative Humidity
air we breathe and use for ventilation. • Dry air. exists when all of the contaminants and water vapor have been removed from atmospheric air. By volume, dry air contains about 78 percent nitrogen, 21 percent oxygen, and 1 percent other gases. Dry air is used as the reference in psychrometrics. • Moist air. is a mixture of dry air and water ...
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