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Abstract
Section 1, the nature of aerosols, explains their instability, their action on light, the mutual influence of particles, the drag of particles and their size and shape. Sections 2, 3 and 4 are concerned with atmospheric aerosols.
Section 2 is about measuring the aerosols of the atmosphere and describes condensation nucleus counters and the way in which the size of particles initiating condensation depends on supersaturation. Visual range and atmospheric opacity are discussed, the latter having possible effects on climate.
Section 3 discusses the generation of aerosols in the atmosphere, including volcanoes, desert dust, trees and human sources, particularly combustion. Size distributions of the atmospheric aerosol are the subject of Section 4, including impactor sampling.
The rest of the article is devoted to laboratory aerosols and fundamental aerosol science: Section 5, aerosol generators; Section 6, particle size and size distributions; Section 7, the dynamics of aerosol particles; Section 8, Brownian motion and diffusion; Section 9, coagulation; Section 10, evaporation and condensation; Section 11, compositional analysis, including individual particles.