If a solid substance is pressurized past its critical pressure, what happens? Is the critical pressure only a factor when a substance is over the critical temperature also?

On another note what makes critical fluids special, and what is the distinguishability between critical fluids and super-critical fluids?


I think you misunderstand the definitions.

The critical temperature is the temperature above which no amount of pressure will cause a gas to liquefy.

The critical pressure is the pressure which will cause a gas to liquefy at its critical temperature.

A supercritical fluid is another state of matter. A liquid and a gas phase have been subjected to pressure such that the two phases disappear and only one phase remains.

I don't think critical fluid has any real definition other than perhaps a liquid-gas mixture at the critical point (critical temperature and critical pressure). I think this point would be more theoretical than real. You'd be trying to balance the system on a razor's edge.


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