Relative humidity
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- Relative humidity The (dimensionless) ratio of the actual vapor pressure of the air to the saturation vapor pressure. The relative humidity is usually expressed in per cent, and can be computed from psychrometric data. See humidity.
NSIDC - Cite This Source - This Definition - Absolute humidity, Air mass, Air pollutant, Dew point, Humidity, Psychrometric tables, Specific humidity, Unstable air