When the phase diagram for a substance has a solid-liquid phase boundary line that has a ________ slope,the substance can go from solid to liquid,within a small temperature range,via the application of pressure.
A)positive
B)zero
C)y = 1
D)negative
E)y = 0

Question

Quizplus · Accepted Answer

A negative slope on the solid-liquid phase boundary line indicates that increasing pressure can lower the melting point of the solid, allowing it to melt within a smaller temperature range. This is known as the pressure-melting point effect, and is seen in substances such as ice.

When the Phase Diagram for a Substance Has a Solid-Liquid