Abstract
MILLSl recently described an apparatus for determining the mean diameter of the particles of a powder. This method, based on the measurement of the capillary pull of the interstitial pores, is not applicable in the case of very fine particles, since h, the capillary pull, cannot exceed the barometric height and l, the length of the column of the powder, must be kept as short as possible. The present communication describes in brief an alternative method (based on permeability principles) which is free from this limitation. The apparatus is illustrated in Fig. 1.
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References
Mills, G. L., Nature, 161, 313 (1948).
Sullivan, R. R., and Hertell, K. L., “Adv. Colloid Science”, 1, 37 (Interscience Publishers, Inc., New York, 1942).
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LAKHANPAL, M., ANAND, V. & PURI, B. A Method of determining Particle Size of Powders. Nature 176, 692 (1955). https://doi.org/10.1038/176692a0
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DOI: https://doi.org/10.1038/176692a0
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