Saturated Air

To reach 690 kPa (100 psi) air at 100% humidity, it is necessary to compress approximately 0.23 ml (8 ft.’) of free air, with its inherent moisture, into 0.028 ml (one cubic foot), since atmospheric humidity is usually more than 12.5% at
ambient. All undried compresed air systems at 690 kPa (100psi) and ambient temperatures are at 100% relative humidity.