see hair hygrometer, torsion hygrometer, goldbeater's-skin hygrometer); 3) those that depend upon condensation of moisture (
see dewpoint hygrometer, frost point hygrometer); 4) the class of instruments that depend upon the change of chemical or electrical properties due to the absorption of moisture (
see absorption hygrometer, electrical hygrometer, carbon-film hygrometer element, dew cell); 5) the class of instruments that depend upon the diffusion of water vapor through a porous membrane (
see diffusion hygrometer); and 6) the class of instruments that depend upon measurements of the absorption spectra of water vapor (
see spectral hygrometer).
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