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Stokes law gives the terminal settling velocity of a small particle as proportional to

  • A.The inverse of the diameter
  • B.The square of the particle diameter
  • C.The particle diameter
  • D.The square root of the diameter

Answer: B

Because the dependence is quadratic, halving the diameter quarters the settling velocity and quadruples the chamber length needed to catch it. That steep falling-off is exactly why gravity settling is useless for the fine fraction that matters most to health.

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