![]() The density of dry air with the same total pressure p as in the mixture (dry air + vapor partial pressure) - can be calculated as a reference as X = m w / m a = specific humidity or humidity ratio (kg h2o /kg dry_air ) ![]() V = specific volume of moist air per mass unit of dry air and water vapor (m 3 /kg) When vapor content increases in moist air the amount of Oxygen and Nitrogen are decreased per unit volume and the density of the mix decreases since the mass is decreasing.īased on specific volume of moist air the moist air density can be calculated Water vapor is relatively light compared to diatomic Oxygen and diatomic Nitrogen - the dominant components in air. The amount of water vapor in air influences the density. T = absolute dry bulb temperature (K) Density of Moist Air - an Air Vapor Mixture R w = 461.5 - individual gas constant water vapor (J/kg K) P w = partial pressure of water vapor (Pa, N/m 2) The density of the water vapor can be calculated T = absolute dry bulb temperature (K) Density of Water Vapor R a = 286.9 - individual gas constant of dry air (J/kg K) ![]() P a = partial pressure of dry air (Pa, N/m 2) The density of a gas, dry air, water vapor - or a mixture of dry air and water vapor like moist or humid air - can be calculated with the Ideal Gas Law. When the temperature increases a higher molecular motion results in expansion of volume and a decrease of density. The density of humid air varies with water content and temperature.
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