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. 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. 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. 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. Dew point temperature of air at one atmospheric pressure (1.013 bar) is ${18}^{\circ }C$. The air dry bulb temperature is ${30}^{\circ }C$. The saturation pressure of water at ${18}^{\circ }Cand{30}^{\circ }C$ are 0.02062 bar and 0.04241 bar respectively. The specific heat of air and water vapour respectively are 1.005 and 1.88 kJ/kgK and the latent heat of vaporization of water at $0^{\circ }C$ is 2500 kJ/kg. The specific humidity (kg/kg of dry air) and enthalpy (kJ/kg of dry air) of this moist air respectively, are

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