Abstract
Sulfuric acid aerosols consisting of droplets of narrow size distribution in the tenth micron size range have been prepared by an evaporation-condensation technique, and the particle size distribution has been determined by light scattering. The particle size increased with increasing boiler temperature and decreased sharply with flow rate. The use of foreign nuclei such as NaCl was of no advantage in the preparation. The spread of the distribution as measured by the coefficient of variance ranged from about 0.10 to 0.30. These aerosols could be grown by passing over dilute solutions of sulfuric acid. The sulfuric acid droplets absorbed water until their vapor pressure reached that of the master solution. The extent of growth depended upon contact time varying from about 3% increase in average radius for 10 −1 sec. to equilibration for about 100 sec. The coefficient of variance remained approximately constant upon growth, indicating that the rate of growth was proportional to particle volume.
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