Average particle size
Average particle size when, as a result of experimental observations, the size distribution of a particulate system has been established on the basis of any two of its normal characteristics‑number, length, area or volume‑the group values obtained may be represented by an average value. The relative percentage frequency curve provides a means of establishing a mode, the most commonly occurring value, a median, the line dividing the area under the curve into equal parts, a mean, the vertical at the mean value passing through the center of gravity of a sheet of uniform thickness cut to the shape of the distribution. For a symmetrical distribution these values coincide, while for slightly skewed distributions an approximate relationship
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