Also found in: Medical.
hair hygrometer[′her hī′gräm·əd·ər]
A hygrometer in which the sensing element is a bundle of human hair, which is held under slight tension by a spring and which expands and contracts with changes in the moisture of the surrounding air or gas.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An instrument to measure humidity. It uses one or more human hairs, which are held under tension by a spring. The length of hair increases or decreases, depending on the prevalent humidity. Also called a hair hygrometer.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved