In my everyday patrol of the internet looking for supercritical fluid stuffs, I've found these videos of the transition from supercritical fluid to liquid-gas equilibria.
The first one shows the aparatus employed, and the substance is benzene.
The second one, also shows the experimental setup. The liquid is ethane.
This 3rd one can be CO2, but it's not said.
An a second one, same "liquid" as previous one but at zero "g"
Finally, supercritical water transition.