The relationship between Specific and Relative Humidity of Air

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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 density of the air, the specific humidity can be expressed as:

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

where

x = specific humidity of air vapor mixture (kg/kg)

φ = relative humidity (%)

ρ_ws = density of water vapor (kg/m³)

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

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Related Topics

• Air Psychrometrics - The study of moist and humid air - air condition - psychrometric charts, Mollier diagrams, air temperature, absolute and relative humidity, moisture content and more .

Related Documents

• Absolute Humidity of Air - Humidity - or moist - is the water vapor present in air. Commonly used terms are Absolute, Specific and Relative Humidity
• Humidity Ratio of Air - Humidity ratio (GPP) is the ratio between actual mass of water vapor present in moist air - to the mass of dry air
• Recommended Relative Humidity - Recommended relative humidity level
• Relative Humidity of Air - The relative humidity of air can be expressed by partial vapor and air pressure - density of the vapor and air - or by the actual mass of the vapor and air