A sample of moist air at a total pressure of 90 kPa ha a dry bulb temperature of ${30}^{\circ }C$. If the absolute humidity of air is $22.9gm/kg$ of dry air, then then relative humidity of air is closest to
$(P_{sat}at{30}^{\circ }C=4.24kPa)$

Q. A moist air sample has dry bulb temperature of ${30}^{\circ }C$ and specific humidity of 11.5 g water vapour per kg dry air. Assume molecular weight of air as 28.93. If the saturation vapour pressure of water at ${30}^{\circ }C$ is 4.24 kPa and the total pressure is 90 kPa, then the relative humidity (in %) of air sample is

Q. The pressure, dry bulb temperature and relative humidity of air in a room are 1 bar, ${30}^{\circ }C$ and 70%, respectively. If the saturated steam pressure at ${30}^{\circ }C$ is 4.25 kPa, the specific humidity of the room air in kg of water vapour/kg dry air is

Q. The dry bulb temperature for sample of moisture is ${37}^{o}C$, while its relative humidity is $50$% and the barometric pressure is $101.325kPa$. What is the enthalpy of moist air?
(Saturation pressure of water vapour at ${37}^{o}C$ is $6.2795kPa)$.

Q. A room contains 35 kg of dry air and 0.5 kg of water vapor. The total pressure and temperature of air in the room are 100 kPa and ${25}^{\circ }C$ respectively. Given that the saturation pressure for water at ${25}^{\circ }C,$ is 3.17 kPa, the relative humidity of the air in the room is

Q. The specific volume of dry air in an air-water vapour mixture having temperature 24${}^{\circ }$C relatice humidity 40% at standard barometric pressure 100 kPa if the saturated air pressure is 20 kPa is