Particle Size Distribution

  1. What is the relationship between the Frequency Distribution, Cumulative Distribution and Particle Size?
     
  2. jcsd
  3. Baluncore

    Baluncore 2,964
    Science Advisor

    Frequency distribution and cumulative distribution are statistical concepts.
    You have a sample of particles that range from a minimum to a maximum size.

    You perform a sieve analysis so as to sort or classify them into size ranges.
    See; http://en.wikipedia.org/wiki/Sieve_analysis

    You then weigh the particles in each class, (size range), and record that data.
    By converting the weight falling in each size class to a percentage of the total you eliminate sample size variation.

    If you tabulate or plot that data as a bar graph against size class you will have a frequency distribution. Different grinding or transport mechanisms have characteristically different frequency distributions. The comparison of graphed frequency distributions is quick and easy.

    If you then compute a running total over the frequency distribution data, you will generate a cumulative frequency distribution, it starts at zero and finally reaches 100%. From that you can quickly identify what proportion of the mass of particles is above or below a particular size.
     
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