hair hygrometer

From Glossary of Meteorology


A hygrometer that measures relative humidity by means of the variation in length of a strand of human hair.
The length variation of a properly treated hair is 2%–2.5% when the humidity changes from 0%–100%. The hair hygrometer is considered to be a satisfactory instrument in situations where extreme and very low humidities are seldom or never found. The rate of response is very dependent on air temperature; the lag time increases with decreasing temperature. For air temperatures between 0° and 30°C and relative humidities between 20% and 80%, a good hair hygrometer should indicate 90% of a sudden change in humidity within about three minutes.


higrómetro de cabello

Es un higrómetro que mide la humedad relativa por medio de la variación en la longitud de una hebra de cabello humano.

La variación de longitud de un cabello tratado adecuadamente es de 2 a 2.5 % cuando la humedad cambia de 0 a 100 %. El higrómetro de cabello se considera un instrumento satisfactorio en situaciones en las que rara vez o nunca se encuentran humedades extremas y muy bajas. La tasa de respuesta depende mucho de la temperatura del aire; el tiempo de retraso aumenta con la disminución de la temperatura. Para temperaturas del aire entre 0 y 30 ° C y humedades relativas entre el 20 y el 80 %, un buen higrómetro de cabello debe indicar el 90 % de un cambio repentino en la humedad en aproximadamente tres minutos.

Copyright 2024 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact [email protected]. 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.