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Measuring the relative humidity of air is an important challenge formeteorological measurements, food conservation, building design, andevaporation control, among other applications. Relative humidity can bemeasured with a psychrometer, which is a hygrometer composed of two identicalthermometers. The bulb of one thermometer is covered by a wick soaked withwater so that evaporative cooling makes it indicate a lower temperature thanthe dry-bulb thermometer; it is possible to determine the relative humidityfrom the difference between these readings. We describe both a model and anexperimental setup to illustrate the principle of a psychrometer for apedagogical laboratory. The science of psychrometry could be more broadlytaught at the undergraduate level to help introduce students to aspects ofmeasurement techniques, fluid mechanics, heat transfer, and non-equilibriumthermodynamics.

Measuring relative humidity from evaporation with a wet-bulb thermometer: the psychrometer