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A sample of moist air at a total pressure of 85 kPa has a dry bulb temperature of 30°C (saturation vapour pressure of water = 4.24 kPa). If the air sample has a relative humidity of 65%, the absolute humidity (in gram) to water vapour per kg of dry air is _____.
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- 7.17 gm
- 18.25 gm
- 20.17 gm
- 21.20 gm
Correct Option: C
PT = 85 KPa, DBT = 30ºC
Pw.s = 4.24 KPa, RH = 65%
∴ Pw = Pw.s × RH /100 = 4.24 × 0.65 = 2.756 kPa
| now ω = 622 | gm (or water)/ mg.d.a | |
| PT |
| ∴ ω = | = 20.17 gm (or water)/ mg.d.a | |
| 85 |
