On a phase diagram, the critical temperature is .
A) the temperature below which a gas cannot be liquefied
B) the temperature required to melt a solid
C) the temperature above which a gas cannot be liquefied
D) the temperature at which all three states are in equilibrium
E) the temperature required to cause sublimation of a solid

Question

Quizplus · Accepted Answer

The critical temperature is the temperature above which a gas cannot be liquefied, no matter how much pressure is applied. It is the temperature at which the gas and liquid phases become indistinguishable from each other, and the substance is said to be in a supercritical state. The other choices are incorrect because they do not accurately describe the critical temperature.

On a Phase Diagram, the Critical Temperature Is