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Mole fraction of water vapor is the ratio of water molecules to air and water molecules. The pressures are stated in mega-Pascals, where a Pascal is a Newton per square meter, and as a multiple of standard atmospheric pressure. Density of the mix of dry air and water vapor - moist humid air. Again, saturation absolute humidity, vs, uses e s instead of e. Means exhibited mostly shift changes that did not impact the flux magnitudes, while variances of water vapor densit y fluctuations were occasionally in poor agreement, especially following rainfall events. Calculation of thermodynamic properties of overheated steam (upper limit: 799 C, 1000 bar) Calculation of thermodynamic properties of saturated steam. Calculation of thermodynamic properties of water. What is the Vapor Density of Water The vapor density of water is approximately 0.623. Water Vapor and Vapor Pressure Saturated Vapor Pressure, Density for Water Tempīelow are some selected values of temperature and the saturated vapor pressures required to place the boiling point at those temperatures. Water vapor density measurements were in generally good agreement, but temporal drift occurred in different directions and magnitudes. Some scientific and engineering data online.