Engineering Board Exam Reviewer · Thermodynamics · medium
Moist air at 101.325 kPa has a vapor partial pressure of 2 kPa. What is the humidity ratio?
- 0.01228 kg/kg dry air
- 0.01974 kg/kg dry air
- 0.01252 kg/kg dry air
- 31.51207 kg/kg dry air
Answer
C. 0.01252 kg/kg dry air
Solution
W = 0.622 Pv/(P - Pv) = 0.622(2)/(99.325) = 0.01252 kg/kg dry air.
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