Heat is added to a substance, but its temperature does not rise. Which one of the following statements provides the best explanation for this observation?
A)The substance must be a gas.
B)The substance must be a non-perfect solid.
C)The substance undergoes a change of phase.
D)The substance has unusual thermal properties.
E)The substance must be cooler than its environment.

Question

Quizplus · Accepted Answer

When a substance undergoes a change of phase, such as melting or evaporation, heat is added but the temperature remains constant until the phase change is complete. This is called the heat of fusion or heat of vaporization.

Heat Is Added to a Substance, but Its Temperature Does