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- Hygrometer An instrument which measures the water vapor content in the atmosphere. There are several different means of transduction used in measuring this quantity and hence various types of hygrometers. These are: a) the psychrometer, which utilizes the thermodynamic method; b) the class of instruments which depends upon a change of physical dimension due to absorption of moisture (hair hygrometer, for example); c) those which depend upon condensation of moisture (dew point hygrometer); d) the class of instruments which depend upon the change of chemical or electrical properties due to absorption of moisture, and some others.
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- Accuracy, Air temperature, gastropod, Instrument shelter, instrumental record, Psychrometer, Scale, Shield, Thermograph, Thermometer