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
A. 0.048
B. 0.079
C. 0.122
D. 0.152
Answer: Option D
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H=0.622*(Pa/(Pt-Pa))
H=0.622*(19.91/(101.3-19.91))
H=0.1521
explain please