Phase Diagram Critical Point
A scientist measures the pressure and temperature of a sample. When plotted on a phase diagram, the corresponding point lies on a vertical line directly above the critical point. Which of the following statements must be true of the sample?
A
The sample is a fluid in equilibrium.
B
The sample is a vapor.
C
The sample exists simultaneously in all three states: solid, liquid, and gas.
D
The sample is in a state where its gas and liquid phases are indistinguishable.