Question

What do the sections between the lines on a phase diagramirepresent?

A. The ranges where temperature and pressure are constant in a
substance
OB. The regions in which temperature and pressure change a
substance's phase
OC. The areas in which the kinetic energy of a substance is constant
OD. The conditions in which a substance exists in a certain phase
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Answer 1

The answer is D. The sections between the lines on a phase diagram represent the conditions in which a substance exists in a certain phase. For example, the area between the solid and liquid lines represents the conditions in which a substance can exist as either a solid or a liquid. The exact conditions under which a substance will change phase depend on the substance itself.