This is my second post after that of "Shuttle Main Engines" in which I use again the question: what is happening here? First of all, open the .jpg file below. It shows a F-4 Phantom breaking the sound of barrier. I'm interested on what happens in the condensated flow. First of all, why is it condensated?. I know the flow shown is a transonic flow. So that, the shock wave is almost being formed in the zone in which Ma=1. In fact, it seems to be two shock waves being formed. Behind the shock, the Pressure and Temperature raise a lot. But I have not found reasons for why this rising could provoke a condensation of the air in water vapor. On the other hand, do you think the borders of the condensed flow are the shocks waves themselves?. Are there any reason for thinking so? Any comments appreciated.