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Hygrometers

An apparatus used to measure the degree of humidity in the air. - The condensation hygrometer is made up of a metallic capsule inside which ether is evaporated to drop the temperature. - The hair hygrometer uses the stretching of the hair caused by humidity to make an approximate measurement. - The psychrometer is based on thermodynamic properties and double measures with a dry thermometer and a humid one. - The electronic hygrometer measures the change in the electrical properties with humidity. Wood is notably hygroscopic, absorbent and releases humidity depending on the environment in which it is found.