By observing the phase diagram of nitrogen, hydrogen and carbon dioxide, I discovered the supercritical region.
I can easily buy a gas tank of carbon dioxide at 250 Bars. However I never saw any cylinder of water or liquid nitrogen at 250 Bar. Why not? At my university, we usually use an thermally isolated, but opened, vessel. In my opinion, a cylinder of liquid nitrogen would be more convenient to manipulate. Is that not true?
According to this diagram, at the temperature of 300K and pressure of 25 MPa (250 Bars), I am just in the supercritical region. Isn't that possible?