How much water is vapor in the air at 20 degrees Celsius and 60% relative humidity.

The density of saturated vapor in air at a temperature of 20 degrees Celsius: ρ (sat) = 17.7 g / cu. m. This value is taken from the reference table “Dependence of pressure and density of saturated steam on temperature”. The density of steam in the air ρ (steam) at relative humidity φ = 60% is found from the formula: φ = (ρ (steam): ρ (sat)) • 100%; ρ (pair) = (φ • ρ (sat)): 100%; ρ (steam) = (60% • 17.7 g / m3): 100%; ρ (pair) = 10.62 g / cu. m = 0.01062 kg / cubic meter m. To find out how much water is contained in the form of steam in the air, we calculate the mass of water by the formula: m = ρ (steam) • V. Next, we find the volume of the room in which it is necessary to determine the mass of water by the formula for the volume of a parallelepiped: V = a • b • c, where a – length, b – width, c – room height. Answer: m = (0.01062 kg / cubic meter) • a • b • c.