(Also called density temperature.) The virtual temperature Tv = T(1 + rv/ ε)/(1 + rv), where rv is the mixing ratio and ε is the ratio of the gas constants of air and water vapor, ≈ 0.622.
In atmospheric thermodynamics, the virtual temperature of a moist air parcel is the temperature at which a theoretical dry air parcel would have a total pressure and density equal to the moist parcel of air.The virtual temperature of unsaturated moist air is always greater than the absolute air temperature, however, the existence of suspended cloud droplets reduces the virtual temperature.
