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The Reynolds number of a falling drop measures

  • A.the ratio of the drop radius to the mean free path
  • B.the ratio of latent heat to sensible heat transfer
  • C.the ratio of inertial to viscous forces in the flow
  • D.the ratio of surface tension to gravitational force

Answer: C

Stokes drag applies only while the Reynolds number is small and the flow remains creeping. Cloud droplets satisfy this, but drizzle and raindrops do not and require empirical drag relations instead. The transition occurs near forty micrometres in radius.

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