What is the inversion line?
The locus of all the points at which the Joule-Thomson coefficient is zero is called the inversion line or inversion curve.
What is inversion temperature?
The temperature at a point where the constant enthalpy line intersects the inversion line is called inversion temperature.
What is the maximum inversion temperature?
The point at which the inversion curve intersects the y axis (zero pressure line) is the maximum inversion temperature.