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Relationship between Specific and Relative Humidity of Air

Calculating specific humidity of moist air - knowing relative humidity, water vapor and air density

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Humidity is the quantity of water vapor present in air. It can be expressed as an absolute, specific or a relative value.

If we know the relative humidity of the moist air and the water vapor density and the density of the air, the specific humidity can be expressed as:

x = 0.622 φ ρws / (ρ - ρws) 100%                               (1)


x = specific humidity (humidity ratio) of air vapor mixture (kgh2o/kgdry_air)

φ = relative humidity (%)

ρws = density of water vapor (kg/m3)

ρ = density of the moist or humid air (kg/m3)

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  • en: specific realtive humidity
  • es: humedad realtive especĂ­fica
  • de: spezifische realtive Luftfeuchtigkeit
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