Relationships between Mass and Number Concentrations of Respirable Airborne Dust in British Coal MinesPart 1—Mass-Number Relationships for Coal-Dust Clouds

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Abstract
A theoretical study is described of the relationship between the number concentrations of dust particles as they are measured in British coal mines and the corresponding mass concentrations of dusts collected by size selecting gravimetric sampling instruments. Comparisons are made between the mass-number relationship found experimentally and the relationship calculated from theoretical considerations. The mass concentration found experimentally to correspond to a given particle concentration is considerably greater than would be expected on theoretical grounds. This could be due to incorrect assumptions about article shape factors in the theoretical treatment but there is evidence to suggest that some of the discrepancy is due to incorrect operation of the gravimetric size selectors and that they may accept particles considerably larger than their intended limiting size.

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