Hair Hygrometer
2 definitions

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An instrument used to monitor relative humidity by measuring the changes in the length of human hair that accompany humidity variations.

FK Reading Ease
8.3

FK Grade Level
Graduate School
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  • This definition has not yet been approved by a moderator.

    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.

    FK Reading Ease
    40.9

    FK Grade Level
    College
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