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How many particles of 1 micrometre diameter have the same total volume as one particle of 10 micrometres?

  • A.10
  • B.100
  • C.10,000
  • D.1,000

Answer: D

Volume scales with the cube of the diameter, so a tenfold increase gives a thousandfold volume. This is precisely why number and volume distributions of the same powder look so different. Neither is wrong; they answer two different questions.

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