Excerpt from The Relative Accuracy of Certain Methods for Measuring Relative Humidity
The dew point is that temperature at which the air could be saturated with the aster vapor present in it; The pressure at the dew point can be secured from vapor tension tables and the relative humidity calculated. This method is not accurate in moving air. In still air the layer which is in contact with the metallic surface is in equi librium; in a breeze the constant renewal or the air near the surface prevents its attaining the dew point until a lower temperature is reached.
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