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If allowed to do work on the surroundings, the temperature will decrease as the pressure decreases.

If expanded against a vacuum or adiabatically, most gases will get colder. At room temperature, all gases except hydrogen, helium, and neon cool upon expansion by the Joule-Thomson process; these three gases experience the same effect but only at lower temperatures; when starting at room those three gases will actually WARM when expanded across a valve.

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