studied solid particles and solution droplets in the large and giant size ranges. Her results for particles from a continental environment (Hungary) are plotted in Fig. 39, where Na is the number concentration of particles with radius larger than values on the abscissa. It can be seen that in summertime the number of droplets is very large even at low humidities. This finding is obviously caused by the presence of acid or supersaturated salt solution droplets in aerosol samples. This result confirms optical observations of Rozcnberg (1967). who found that significant particle growth can be detected even around a relative humidity of 30 %.
From the results plotted in Fig. 39 the relative growth of a given particle size as a function of relative humidity can be calculated. The curvcs obtained in this way are shown for the winter and summer half-years in Fig. 40. It follows from this figure log Nn [rm-3)
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