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Moist Air - Specific vs. Relative Humidity

Specific humidity of moist air vs. 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)

where

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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Related Topics

  • Air Psychrometrics

    Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

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