Abstract
Observations on evaporation from liquid surface under a high and a medium vacuum have revealed the existence of two new surface, phenomena, the former of which we call icefield-torpid surface and the latter, concave-evaporating surface.Measurements of the effect of vapor pressure and of the pressure of the inert gas on the evaporation rate have served to clarify the mechanism of mass transfer in an evaporating space under a high and a medium vacuum.From the above the following conclusions may be drawn:1. Molecular evaporation consists of two mechanisms, one of which is molecular-projective-evaporation, where the vapor molecules pass relatively freely through the inert gas, and the other is molecular-burst-evaporation, where the escaping vapor pushes the inert gas along before it.2. Mass transfer in the evaporating space under a medium vacuum may be understood as a slipdiffusion as shown by Eq. (10), when the rate does not reach the maximum.
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