On a phase diagram,the critical pressure is ________.
A)the pressure required to melt a solid
B)the pressure below which a substance is a solid at all temperatures
C)the pressure above which a substance is a liquid at all temperatures
D)the pressure at which a liquid changes to a gas
E)the pressure required to liquefy a gas at its critical temperature

Question

Quizplus · Accepted Answer

The critical pressure on a phase diagram is the pressure required to liquefy a gas at its critical temperature. At this point, the gas and liquid states become indistinguishable, known as the critical point. Above this pressure, it is impossible to liquefy the gas regardless of the temperature, and it will remain in the gas state.

On a Phase Diagram,the Critical Pressure Is ________