Air - Density, Specific Weight and Thermal Expansion Coefficient vs.Pressure and Temperatures Air density at pressure ranging 1 to 10 000 bara (14.5 - 145000 psi) and constant selected temperatures. Air - Composition and Molecular Weight Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.Air - Absolute Humidity Absolute humidity is the actual mass of water vapor present in the air water vapor mixture.Air Psychrometrics Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.Maximum specific humidity at some common temperatures: Note! - be careful with these equations at higher temperatures - as indicated in Temperature and Moisture Holding Capacity of Air. The water vapor pressure is small regarding to the atmospheric pressure and the relation between the humidity ratio and the saturation pressure is almost linear. P ws = saturation pressure of water vapor X s = maximum saturation humidity ratio of air (kg water/kg air, lb water/lb dry_air) The maximum amount of water vapor in the air is achieved when p w = p ws the saturation pressure of water vapor at the actual temperature. P a = atmospheric pressure of moist air (Pa, psi) P w = partial pressure of water vapor in moist air (Pa, psi) M a = mass of dry air (kg, lb) Humidity Ratio by Vapor Partial Pressureīased on the Ideal Gas Law the humidity ratio can be expressed as X = humidity ratio (kg water/kg dry_air, lb water/lb dry_air) Humidity ratio is normally expressed in kilograms (or pounds) of water vapor per kilogram (or pound) of dry air. the ratio between the actual mass of water vapor present in moist air - to the mass of the dry air.Humidity ratio by mass can be expressed as the partial pressure of vapor in the air - to the partial pressure of the dry air.the mass of water vapor in the humid air - to the mass of dry air, or by.The humidity ratio of moist air can be expressed with
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