An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively. The humidity of air sample expressed as kg of water vapour/kg of dry air is__________________?

Question

Accepted Answer

0.152. Humidity (W) is calculated using the formula W = 0.622 * P_v / (P - P_v), where P_v is the vapour pressure at the dew point and P is total pressure.