I am writing a document on the Joule-Thomson effect. But in my research for it I have come across something that I am not completely clear on. In my document I explained the free expansion of an ideal gas and am trying to transition/segue into the Joule-Thomson effect. However now I am having trouble differentiating between the two (free expansion and J-T effect). I understand that there is no change of temperature in the free expansion of an ideal gas because the internal energy does not change and the internal energy of an ideal gas is solely a function of temperature, therefore temperature doesn't change But what about the free expansion of a real gas? The existence of inter molecular forces in a real gas means that the temperature will change. Can someone explain to me how this is different from the Joule-Thomson effect? Or are they essentially the same and the free expansion of a real gas will inevitably produce the Joule-Thomson effect? Any clarification is much appreciated!