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What is the specific humidity, if pressure of water is 2 atm and total pressure is 12 atm?

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What is the specific humidity, if pressure of water is 2 atm and total pressure is 12 atm?

(a) 20%

(b) 40%

(c) 50%

(d) 80%

This question was posed to me in my homework.

This interesting question is from Humidity (Psychrometric) Chart topic in chapter Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

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Best answer
The correct choice is (d) 80%

The best explanation: Specific humidity = 2/(12 – 2)*100 = 20%.

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