Moist Air Properties

Absolute humidity, dew point, wet-bulb temperature, enthalpy and density from temperature and relative humidity.

Unit system

Inputs

Total pressure (absolute)

Use 1.013 bar for atmospheric air; for a compressed-air line enter the line pressure.Dry-bulb temperature

Relative humidity

Humidity ratio (kg water / kg dry air)

0.01190

Dew point

16.7°C

Wet-bulb temperature	19.47 °C
Enthalpy (per kg dry air)	55.46 kJ/kg
Density of the moist air	1.176 kg/m³
Specific volume (per kg dry air)	0.8608 m³/kg
Water vapour partial pressure	0.01902 bar a
Saturation pressure	0.0317 bar a
Humidity ratio at saturation	0.02008
Water per cubic metre (g/m³)	13.82
Reading	8.3 K above the dew point; the wet-bulb depression of 5.5 K is the drying capacity of this air.

Dry air and water vapour are treated as ideal gases (Dalton partial pressures). At atmospheric conditions the deviation is a fraction of a per cent.
Enthalpy and specific volume are per kilogram of DRY AIR — the common basis of psychrometric charts.

A PDF carrying the inputs, results, assumptions and the source. A one-time code is sent to your address.

Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.