During a phase change, the temperature of a substance:

During a phase change, the temperature of a substance:

Step 1: Understand what a phase change is. A phase change is when a substance changes from one state to another, like from solid to liquid (melting) or from liquid to gas (evaporation).
Step 2: Know that during a phase change, the substance is either absorbing heat (gaining energy) or releasing heat (losing energy).
Step 3: Realize that even though heat is being added or removed, the temperature of the substance does not change during this time.
Step 4: Remember that the temperature will only change once the phase change is complete.

Phase Change – A transition between different states of matter (solid, liquid, gas) where temperature remains constant.
Heat Transfer – The process of energy transfer that occurs during a phase change, affecting the state but not the temperature.