What devices are used to determine air humidity? Describe how they work.

Psychrometer consists of two thermometers. One thermometer measures the temperature of the air, and the second bulb is moistened with water. Because water evaporates from the fabric, then the second thermometer is cooled. The intensity of evaporation, and hence the temperature of the second thermometer, depends on the humidity in the room. The action of the hair hygrometer is based on the property of defatted hair to change its length when the air humidity changes. The condensation hygrometer determines the absolute humidity by measuring the dew point.

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