ENSC 461 (S 11) Gas Vapor Mixtures and HVAC 1 Gas Vapor Mixtures and HVAC Atmospheric air normally contains some water vapor (moisture). The dry-air contains no water. Although the amount of water vapor in the air is small, it plays a major role in human comfort and thus in air-conditioning applications. The temperature of air in air-conditioning applications ranges from about -10 to 50°C. In t...

and one observes that the vapor pressure is lowered correspondingly. If water is added, the matrix swells by the same pressure. The fact that water can be pressed out of a gel, and that the swelling pressure has been found to be equivalent to the lowering of its vapor pressure, suggests that the mechanism is the same as in the capillary system, i.e., that the hydrostatic pressure is equivalent ...