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Relative humidity : ウィキペディア英語版
Relative humidity

Relative humidity (abbreviated RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at the same temperature. Relative humidity depends on temperature and the pressure of the system of interest.
== Definition ==
The relative humidity \left(\phi\right) of an air-water mixture is defined as the ratio of the partial pressure of water vapor \left(\right) in the mixture to the equilibrium vapor pressure of water \left(_w}\right) at a given temperature:〔Perry, R.H. and Green, D.W, ''Perry's Chemical Engineers' Handbook'' (7th Edition), McGraw-Hill, ISBN 0-07-049841-5 , Eqn 12-7〕
:: \phi = \over _w}}
Relative humidity is normally expressed as a percentage; a higher percentage means that the air-water mixture is more humid.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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