The properties of air in a room are temperature 35°C and relative humidity 70 percent. Determine (i) the partial pressure of air, (ii) the humidity ratio, (iii) the saturation ratio, (iv) dew point temperature, (v) density of the air-vapour mixture, (vi) the enthalpy of mixture per kg of dry air. Assume room pressure to be 1.0132 bar and the specific heat for the superheated vapour as 1.863 kJ/kg K. Solve the problem with the help of steam tables.