An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point

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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

Options:

A . 0.048

B . 0.079

C . 0.122

D . 0.152

Answer: Option D

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