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Thread: Describing the breadth of a particle size distribution

  1. #1
    Dauda Ladipo Guest

    Question Describing the breadth of a particle size distribution

    I am looking for simple mathematical expressions for describing the spread or breadth of a particle size distribution. An example of what I am looking for is the "mid-fifty-breadth-ratio." (For the definition of this ratio, please see I would like to find other simple ways of describing a size distribution similar to the ratio mentioned above (in that it can be easily calculated). Any advice? Thanks in advance.

  2. #2
    Paul A. Webb - Micromeritics, USA Guest

    Post Graphical analyses

    I think what you are looking for are equations of the type used widely in the geosciences for extracting information from plotted distributions. Some references are:

    Folk, R.L., and W.C. Ward, 1957, Brazos River Bar: A Study of the Significance of Grain-Size Parameters; J. Sediment. Petrology, 27:3-26.

    Krumbein, W. C., Size-frequency distributions of sediments and the normal phi curve, J. Sed. Pet., 8, 84-90, 1983.

    Robert E. Carver (edt.), 1971: Procedures in sedimentary petrology. Wiley-Interscience, A division of John Wiley and Sons, Inc., New York, London, Tokyo, 653 pp. ISBN 47113855 X.

    Chapter 6 (pages 109-127): Mathematical Treatment of Size Distribution Data by Early F.McBride, University of Texas at Austin, Texas, US

    Examples of these types of equations can be found at

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