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State whether the following is true or false.
A dimensionless group has the same numerical value in every system of units.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: D

That invariance is exactly why such groups are used to correlate data, since a Reynolds number computed in imperial units matches one computed in SI. It also provides a check that the group has been assembled correctly.

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