What are some formulas for calculating humid air density?

[Robert James Liguori]

I'm trying to compile a complete list of available humid air density formulas that work with air pressure, temperature and dew point (or RH).

If you know any, please advise.

Thanks,
Robert

 

[Valerie Park]

1. Goff-Gratch Formula: ρ = P/[(Rd*Td) + (Rv*Tv)]Where: ρ = Humid air density (kg/m3)P = Atmospheric Pressure (Pa)Rd = Gas constant for dry air (287.05 J/kgK)Td = Dry bulb temperature (K)Rv = Gas constant for water vapor (461.5 J/kgK)Tv = Virtual temperature (K)2. Magnus Formula:ρ = P/RT * [1 + 0.62198*w/(P - w)]Where:ρ = Humid air density (kg/m3)P = Atmospheric Pressure (Pa)R = Gas constant for dry air (287.05 J/kgK)T = Temperature (K)w = Saturation Mixing Ratio (kg/kg)3. Dalton's Law of Partial Pressures:ρ = P/RT * [1 + (0.622*w/P)]Where: ρ = Humid air density (kg/m3)P = Atmospheric Pressure (Pa)R = Gas constant for dry air (287.05 J/kgK)T = Temperature (K)w = Water vapor pressure (Pa)4. Buck Equation:ρ = P/[(Rd*T) + (Rv*Td)]Where: ρ = Humid air density (kg/m3)P = Atmospheric Pressure (Pa)Rd = Gas constant for dry air (287.05 J/kgK)T = Temperature (K)Rv = Gas constant for water vapor (461.5 J/kgK)Td = Dew point temperature (K)