An air-water vapour mixture has a dry bulb temperature of 60C and a dew point temperature of 40C. The total pressure is 101.3 kPa and the vapour pressure of water at 40C and 60C 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__________________?
A. 0.048
B. 0.079
C. 0.122
D. 0.152
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