When a phase change of a substance occurs what happens to the temperature of the substance?
A) It goes up.
B) It goes down.
C) It does not change.
D) It changes for a while and then levels off.
C) It does not change. At the point where the phase of a substance changes, there is no temperature change but only the phase change. After this, the temperature then goes up or down depending on the type of phase change occurring.
