The phase diagram for a pure substance is shown below. What is the lowest temperature at which liquid can exist?

Question

The phase diagram for a pure substance is shown below.  What is the lowest temperature at which liquid can exist?

Quizplus · Accepted Answer

The lowest temperature at which liquid can exist is the melting/freezing point of the substance, which is the line between the solid and liquid regions on the phase diagram. This line intersects with the x-axis (pressure axis) at approximately 1 atm pressure and 200 K temperature. Therefore, the correct answer is C) 200 K.

The Phase Diagram for a Pure Substance Is Shown Below