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The notation d50 for a powder means

  • A.the very largest particle present is fifty micrometres across
  • B.fifty per cent of all the particles are truly spherical
  • C.the powder sample was measured over fifty seconds
  • D.half the material by the chosen basis lies below that size

Answer: D

It is the median of the distribution and is quoted with d10 and d90 to describe the spread. Whether the basis is volume, mass or number matters greatly and should always be stated. Reports that omit the basis are effectively uninterpretable.

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