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The equivalent spherical diameter of an irregular particle is

  • A.the diameter of a sphere with the same measured property
  • B.the largest single dimension the particle possesses
  • C.the average of its length, its width and its thickness
  • D.the diameter of the smallest sieve that it will pass through

Answer: A

Since a real particle has no single diameter, every technique reports the size of a sphere that would behave the same way in that measurement. Two methods can therefore give different answers for the same powder without either being wrong.

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