Torsion hygrometer

From Glossary of Meteorology

torsion hygrometer

A hygrometer in which the rotation of the hygrometric element is a function of the humidity.

Such hygrometers are constructed by taking a substance in which length is a function of the humidity and twisting or spiraling it under tension in such a manner that a change in length will cause a further rotation of the element.
See hygroscope.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.