Abstract
For about 80 years it has been known that cloud and fog droplets condense on nuclei (the so-called condensation nuclei), but only during the past decade, and particularly during the past five years, has our knowledge increased concerning the size, size-distribution, concentration, and composition of these particles which form the so-called aerosol. The first information gained on the composition, size, and number of condensation nuclei was derived from their light-scattering ability. Early investigators drew the correct conclusion that, because of the decrease of the visibility when the relative humidity exceeds approximately 70 percent, most of the condensation nuclei must be hygroscopic. Moeller (1947) found from measurements of the scattering function of the aerosol at different angular distances from the sun that the average radius of the scattering particles is 0.2 μ.
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References
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aufm Kampe, H.J., Weickmann, H.K. (1957). Physics of Clouds. In: Blackadar, A.K. (eds) Meteorological Research Reviews. Meteorological Monographs, vol 3. American Meteorological Society, Boston, MA. https://doi.org/10.1007/978-1-940033-31-0_1
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