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The most useful single addition to a reported d50 value is usually

  • A.the d10 and d90 values as well
  • B.the temperature of the laboratory
  • C.the name of the instrument operator
  • D.the mass of the sample analysed

Answer: A

Together the three figures describe both the central value and the spread, which is what governs packing and sintering. The measurement basis and the technique should be stated alongside. Four short figures describe a powder better than one long one.

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