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# Moist Air - Degree of Saturation

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

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 / xs                                      (1)

where

μ = degree of saturation

xhumidity ratio of the air (kgh20/kgdry_air)

xshumidity ratio of the air at saturation at the same temperature and pressure (kgh20/kgdry_air)

The degree of saturation can also be expressed as:

μ = φ (pa - pws) / (pa - pw)                               (2)

where

μ = degree of saturation

φ = relative humidity (%)

pw = vapor pressure (mbar)

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

pa = atmospheric pressure of moist air (mbar)

## 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

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

Modify the access date according your visit.

9.29.12