The property measured in the experiment is the ratio of the temperature change to
the change of pressure, ΔT/Δp. Adding the constraint of constant enthalpy and taking
the limit of small Δp implies that the thermodynamic quantity measured is (∂T/∂p)H,
which is the Joule–Thomson coefficient, μ. In other words, the physical interpretation
of μ is that it is the ratio of the change in temperature to the change in pressure when
a gas expands under conditions that ensure there is no change in enthalpy.
The modern method of measuring μ is indirect, and involves measuring the
isothermal Joule–Thomson coefficient, the quantity
The property measured in the experiment is the ratio of the temperature change tothe change of pressure, ΔT/Δp. Adding the constraint of constant enthalpy and takingthe limit of small Δp implies that the thermodynamic quantity measured is (∂T/∂p)H,which is the Joule–Thomson coefficient, μ. In other words, the physical interpretationof μ is that it is the ratio of the change in temperature to the change in pressure whena gas expands under conditions that ensure there is no change in enthalpy.The modern method of measuring μ is indirect, and involves measuring theisothermal Joule–Thomson coefficient, the quantity
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