On the Vapour Pressure Gradient in the Layer near the Cooled Surface of a DewPoint Hygrometer

Abstract

In normal dew-point practice, we take the conventional assumption that the vapour pressure gradient in the layer near the cooled surface is zero. But we know a concentration gradient is set up as the result of the nonuniformity of the temperature. In the present note, the magnitude of the vapour pressure gradient is theoretically estimated.