Answer:
Physical change
Explanation:
In chemistry, a physical change is that change that does not involve the formation of new products as there is no modifications to the chemical structure of the substance involved. There is no change in the chemical composition of the involved substance, rather a physical change in properties including shape, size, density, state of matter etc. A physical change is also easily reversible.
In this case, a physical change involving change of state is concerned. There is a change in state from liquid to gas but the chemical composition of the water molecules are not altered.
