The formation of nuclei of condensation in air initially cleansed of aerosol particles by filtration has been investigated. Such formation may be achieved in the dark. The formation process is accelerated by the action of sunlight or by the introduction into the chamber of thoron free from active deposit. The evolution of these particles in time, as well as their state of charge, has been studied, and an important influence of coagulation on the process has been found. The possible role of such particles as regards the origin and behavior of the properties of natural aerosols must be considered.
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Bricard et al. (1968) studied this question.