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Moist Air - Degree of Saturation

Humidity ratio of moist air to humidity ratio of saturated moist air.

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Degree of Saturation is the ratio of the humidity ratio of moist air - to the humidity ratio of saturated moist air at the same temperature and pressure.

The Degree of Saturation can be expressed as

μ = x / x_s (1)

where

μ = degree of saturation

x = humidity ratio of the air (kg_h20/kg_{dry_air})

x_s = humidity ratio of the air at saturation at the same temperature and pressure (kg_h20/kg_{dry_air})

The degree of saturation can also be expressed as:

μ = φ (p_a - p_ws) / (p_a - p_w) (2)

where

μ = degree of saturation

φ = relative humidity (%)

p_w = vapor pressure (mbar)

p_ws = saturation vapor pressure at the actual dry bulb temperature (mbar)

p_a = atmospheric pressure of moist air (mbar)

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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.

Related Documents

Air - Humidity Measurement from Dry and Wet Bulb Temperature - Relative humidity in moist air can estimated by measuring the dry and wet bulb temperature.
Air - Humidity Ratio - The mass of water vapor present in moist air - to the mass of dry air.
Air - Maximum Moisture Carrying Capacity - Maximum water content in humid air vs. temperature.
Air - Moisture Holding Capacity vs. Temperature - The moisture holding capacity of air increases with temperature.
Compressed Air - Water Content - Saturation pressure and maximum water content in compressed air.
Dry Bulb, Wet Bulb and Dew Point Temperatures - Dry Bulb, Wet Bulb and Dew Point temperatures can be used to determine the state of humid air.
Humid Air vs. the Ideal Gas Law - Pressure, temperature and volume in a perfect ideal gas like moist air (air with water vapor).
Moist Air - Daltons Law of Partial Pressure - The pressure in a mixture of dry air and water vapor - humid or moist air - can be estimated by using Daltons Law of partial pressures.
Moist Air - Density vs. Water Content and Temperature - Density of the mix of dry air and water vapor - moist humid air.
Moist Air - Enthalpy - Sensible and latent heat of moist air.
Moist Air - Properties - Psychrometric table with humid air properties like saturation pressure, specific volume, enthalpy and entropy.
Moist Air - Relative Humidity - Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.
Moist Air - Water Vapor and Saturation Pressure - Saturation pressure of water vapor in moist air vs. temperature.
Water - Saturation Pressure vs. Temperature - Online calculator, figures and tables with water saturation (vapor) pressure at temperatures ranging 0 to 370 °C (32 to 700°F) - in Imperial and SI Units.

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Citation

This page can be cited as

Engineering ToolBox, (2004). Moist Air - Degree of Saturation. [online] Available at: https://www.engineeringtoolbox.com/moist-air-saturation-d_685.html [Accessed Day Mo. Year].

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