Answer: Boiling Water
Explanation:
The phase change takes place in the boiling water as it gets converted from liquid state to vapor state.
This change in state is seen during the time the water is boiling.When the water is boiling at 100 degree Celsius then the liquid form of water gets heated up and starts evaporating.
The evaporating water is in the form of vapor. This phase change is seen at the time of boiling water.