The relative humidity of air equals the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature times 100 %.
If the relative humidity of the air is 51 % and its temperature is 68°F or 20°C , how many molecules of water are present in a room measuring 18 x 11 x 9 ft ? Vapor pressure of water at 20°C is 17.5 torr
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