Mechanical hygrometer

{
  "id": "MLC-T-CHM-007110",
  "term": "Mechanical hygrometer",
  "field": "Chemistry",
  "definition": "An instrument that measures atmospheric humidity by sensing changes in the physical dimensions of a hygroscopic material, such as hair or a specially treated membrane. As the material absorbs or releases moisture, it expands or contracts, and this mechanical movement is translated into a humidity reading. These devices are often calibrated to display relative humidity.",
  "subject": "Chemistry and the Environment",
  "see_also": [
    "film"
  ],
  "references": [
    "PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2195 (https://doi.org/10.1351/pac199062112167)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/mechanical-hygrometer/"
}