A tank contains 21 kg of dry air and 0.3 kg of water vapor at(30 @ and/100 kPa total pressure. Determine: a- The humidity ratio. b- The relative humidity. c- Volume of the tank. S ma " 0-019

Please explain how did it become 8 percent explain the calculation

Inside a building, the temperature is −5°C, and the relative humidity is 31 percent. How much water vapor (in kg) is there in each cubic meter of air?

Humid air flows in a duct at atmospheric pressure. The temperature and relative humidity are  T_db=34℃, T_wb=26℃. Add the point on the attached chart and complete the other properties of this humid air in the table below:

Water vapor is evaporated into the air at T = 25°C and P = 1 atm in a 10m x 100m water pool The distance between the surface of water and air outside of the container is 20 cm (Z2 - Z₁ 20cm) the humidity at Z₁ is XA1 = 2% and that at Z2 is XA2 = 1.9%. The diffusivity of water vapor to air at T = 25°C is DAB 0.282 cm²/s. Universal gas constant R = 0.00008205 .m³atm mol.K = NE Estimate the rate of water vapor (kg/day) evaporated at the surface of the water at z = Z1 |z2 Molar mass of water M = z1 18 g/mol

An apartment has the dimensions 18 m by 9 m by 6 m. The temperature is 35°C, and the relative humidity is 52 percent. What is the total mass (in kg) of water vapor in the air in the apartment?