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The Joule-Thomson coefficient is defined as

  • A.the enthalpy change with pressure at constant temperature
  • B.the temperature change with volume at constant entropy
  • C.the pressure change with temperature at constant volume
  • D.the temperature change with pressure at constant enthalpy

Answer: D

It measures how much a fluid cools per unit fall in pressure when it is throttled, which is exactly a constant enthalpy path. Its sign decides whether throttling can be used for liquefaction. Its value is zero everywhere for an ideal gas.

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