Engineers and air conditioning technicians use hygrometer to define properties of moist air.
Hygrometer is an instrument generally used in meteorological science to know about the properties of air. Besides, it is also used in green houses, incubators, saunas, etc. Hygrometers have evolved along with time. Ancient hygrometers used to be of metal-paper coil type, whereas modern ones can be capacitive, resistive, gravimetric, optical or thermal.
Properties of moist air include presence of humidity in the form of water vapour in dry air. The humidity ratio is present at the saturation level. Moist air also has specific enthalpy, entropy and volume.
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