UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

humidity, relative
The ratio, expressed as a percentage, of the amount of water vapor actually present in air of a given temperature, as compared with the greatest possible amount of water vapor that could be present in air at that temperature. Calculation of relative humidity can be done from tables, special slide rules or calculators, graphs, or complex equations [23]. See also hygrometer; psychrometer.