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Aerodynamic diameter is used to describe a particle because it

  • A.Is easier to measure with a microscope
  • B.Gives the particle's true physical size
  • C.Applies only to spherical particles
  • D.It accounts for shape and density

Answer: D

It is the diameter of a unit density sphere with the same settling velocity, so two particles of quite different shape and density share it if they behave alike. Deposition in the lung and capture in a control device both follow that behaviour.

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