I have seen some phase diagrams that look like this: https://www.learner.org/courses/chemistry/images/text_img/phase_diagram_water.jpg
And also some like this: https://en.wikipedia.org/wiki/Phase_diagram#/media/File:Phase-diag2.svg
My confusion is related to the Critical Point. The first picture doesn't really explain where the gas/supercritical fluid boundary is, and the right angle indicating the supercritical fluid boundary at the critical point seems unusual to me. I have some general questions about behavior beyond the critical temperatures and pressures.
More specifically, suppose you have an arbitrary compound X with a Liquid/Gas critical temperature of 320 K and critical pressure of 40 Bar which follows the general shape of the above phase diagrams. I have the following questions
1) At 330 K and 10 bar (basically beyond the critical temperature but below the critical pressure) would X be a gas? or would it be a supercritical fluid? Would we need more information to be able to decide?
2) As a more general part of 1), is it possible that a gas exists beyond its critical temperature?
3) At pressures above its critical pressure, a liquid can still exist so long as it's temperature is lower than the critical temperature correct?