Does the temperature change while of these phase changes is occurring?

During phase changes, the temperature of a substance remains constant even though heat is being added or removed. For example, when ice melts to water, the temperature stays at 0°C until all the ice has turned to liquid. Similarly, while water boils to become steam, the temperature remains at 100°C until all the water has vaporized. This phenomenon occurs because the energy is used to change the state of the substance rather than to increase its temperature.