Abstract
Abstract During the sampling with a midget impinger for dusts in air, the viscosity of the alcohol-water media may change and this change affects the settling time of particles in a counting cell. The changes in concentration of alcohol-water mixtures daring sampling were determined experimentally and viscosity changes by factors as great as two or more were noted. The effects on settling times for dusts of different densities were calculated by Stokes' Law and observed in the laboratory for various alcohol-water mixtures.
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