= Joule-Thomson inversion curve
{c}
{title2=$\mu_{\rm JT}(T,p)=0$}
The <Joule-Thomson inversion curve> is the set of equilibrium <temperature>–<pressure> states where the <Joule-Thomson coefficient> vanishes. For positive <heat capacity at constant pressure>, its condition is $T\alpha=1$, with $\alpha$ the <coefficient of thermal expansion>. The curve separates locally cooling and warming throttle regions. A finite <isenthalpic process> can cross it, so the inlet sign alone does not fix the total <temperature> change. An <ideal gas> has zero coefficient everywhere, rather than an isolated dividing curve.
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