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The variance of a residence time distribution measures

  • A.the mean residence time value itself
  • B.the conversion achieved in it
  • C.the total volume of the reactor
  • D.the spread of times about the mean

Answer: D

A narrow distribution has a small variance and approaches plug flow, while a broad one approaches a stirred tank. The variance is what feeds into the dispersion and tanks in series models. A narrow curve means near plug flow.

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