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  • Author or Editor: Ralph E. Pasceri x
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S. K. Friedlander
and
Ralph E. Pasceri

Abstract

Previous experimental measurements of particle size spectra of the atmospheric aerosol are reviewed. A four-stage impactor was used to sample the Baltimore aerosol in the size range above 0.4 microns in radius. Particle size was measured with an optical microscope. The size range below 0.1 microns was sampled with a novel rotating disk device and the particle size distribution was measured by electron microscopy. The theory of the disk as applied to the diffusion of aerosol particles is discussed.

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Ralph E. Pasceri
and
S. K. Friedlander

Abstract

Distribution data obtained by sampling the Baltimore aerosol with a cascade impactor are reported for the range between 0.4 and 20 microns radius. Data for the range between 70 Å and 0.1 microns in radius were obtained in two runs with the rotating disk sampler. Greater variations were observed in the lower end of the spectrum than in the upper end. The theory of self-preserving size distributions was used with some success to correlate data obtained in this and other studies. When the theory applies and the r −4 subrange exists, the size distribution is given by n(r)=0.04ϕr −4 where ϕ is the volume fraction of aerosol material.

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