HMW-4 A homogenous mixture of 21 kg of dry air and 0.3 kg of water vapour is contained in a tank at 24°C and 100 kPa total pressure. Treating the mixture as a humid air, thus find: The humidity ratio. ⚫The relative humidity. ⚫ The enthalpy. The volume of the tank. • Is it possible to use the psychrometric chart in finding properties? Why?