Relative humidity

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Description

A measure of the moisture content in the air. Relative humidity is calculated as the ratio of the actual pressure of existing water vapor to the maximum possible (saturated) pressure of water vapor in the atmosphere at the same temperature, expressed as a percentage (ASTM). Relative humidity can be measured using a psychrometer, hygrometer, hygrothermograph, or RH indicator cards.

Synonyms and Related Terms

RH; humidité relative (Fr.); Relative Feuchte (Deut.)

Sources Checked for Data in Record

  • Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
  • ASTM, Standard Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials, Annual Book of ASTM Standards, Section 14, General Methods and Instrumentation, ASTM, G113, 1371-1373, Sep-94
  • Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
  • Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998