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In diffusional growth the rate of change of droplet radius is approximately proportional to

  • A.the supersaturation divided by the radius
  • B.the supersaturation multiplied by the radius
  • C.the square of the droplet radius
  • D.the cube of the droplet radius

Answer: A

The standard result is that r times dr by dt is a constant set by the supersaturation and the thermodynamic conditions. Radius therefore grows as the square root of time, which slows the process markedly as the droplet enlarges.

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