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Engineering ToolBox > Pressure and Mass of Water in Saturated Air

Air pressure and content of water in saturated air 

The maximum water content in saturated air depends on air pressure and temperature.

Gauge Pressure in bar

Gauge Pressure in psi

Example - Water Extracted from an Air Compressor

100 m³ of free air is entering a compressor at atmospheric conditions with 20^oC and 70% water content. The air is leaving saturated at gauge pressure 8 bar and 50^oC.

Based on the diagram above the entering water content can be estimated to aprox. 1.8 kg per 100 m³ free air. 70% of this maximum content is 1.26 kg per 100 m³.

The water content in the leaving air can be estimated to aprox. 0.9 kg per 100 m³ free air.

The difference, 1.26 - 0.9 = 0.36 kg per 100 m³ free air, is extracted in the compressor.