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Match each element of a compartment model with the curve feature it explains.
List I
A. A bypass stream
B. A dead volume
C. A stagnant region exchanging slowly
D. A well mixed active volume
List II
1. a long tail
2. an early spike of tracer
3. the main exponential decay
4. a reduced mean residence time

  • A.A-2, B-4, C-3, D-1
  • B.A-3, B-1, C-4, D-2
  • C.A-2, B-4, C-1, D-3
  • D.A-4, B-2, C-1, D-3

Answer: C

Building the model is a matter of adding just enough elements to reproduce the observed features. Adding more than the data justify makes the fit meaningless rather than better. Parsimony is the guiding principle here.

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