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Sedimentation methods determine size from

  • A.the electrical charge that they happen to carry
  • B.the heat that they release when they are wetted
  • C.the settling velocity of particles in a fluid
  • D.the light that they scatter at very small angles

Answer: C

Stokes's law relates settling velocity to an equivalent diameter, provided the flow stays laminar and the particles do not interfere with one another. Very fine particles settle so slowly that a centrifuge becomes necessary.

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