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State whether the following is true or false.
Throttling an ideal gas leaves its temperature unchanged.

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

Answer: C

The enthalpy of an ideal gas depends on temperature alone, so constant enthalpy means constant temperature and the Joule-Thomson coefficient is zero. Real gases cool or warm depending on which side of the inversion curve they lie.

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