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Supersaturation in the Spontaneous Formation of Nuclei in Water Vapor

出版	National Advisory Commitee for Aeronautics, 1953
URL	http://books.google.com.hk/books?id=pN41i85TiAAC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋According to experience, a certain supersaturation is required for condensation of water vapor in the homogeneous phase; that is, for inception of the condensation, at a prescribed temperature, the water vapor partial pressure must lie above the saturation pressure. The condensation starts on so-called condensation nuclei. Solid or liquid suspended particles may serve as nuclei; these particles may either a priori be present in the gas phase (dust, soot), or may spontaneously be formed from the vapor molecules to be condensed themselves. Only the second case will be considered. Gas ions which facilitate the spontaneous formation of nuclei may be present or absent. The supersaturations necessary for spontaneous nucleus formation are in general considerable higher than those in the presence of suspended particles.