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The Joule-Thomson effect is also known as the Joule-Kelvin effect. This effect is present in non ideal gasses, where a change in temperature occurs upon expansion.
Joule-Thomson coefficient
The Joule-Thomson coefficient is given by
where T is the temperature, p is the pressure and H is the enthalpy.
In terms of heat capacities one has
and
In terms of the second virial coefficient at zero pressure one has
Inversion temperature
[1]
References
Related reading