Discussion
A powder has d10 of 1 micrometre, d50 of 5 and d90 of 25. What is the span, defined as the difference between d90 and d10 divided by d50?
Answer: A
Subtracting 1 from 25 gives 24, and dividing by the d50 of 5 gives 4.8. Span is a dimensionless measure of how broad a distribution is and allows powders of different average size to be compared. It says nothing about whether the distribution is symmetrical.
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