Boiling water is a physical change because nothing changed about the water, all that changed is the temperature of the water once. The evidence that they think might that it might be is the steam and and bubbles of the water, however steam is not a chemical change, its just evaporated water so its still water. A chemical change is a change of the substance to a different substance, such as sugar turning into caramel by with heat. Water boiling is a physical change.
Explanation:
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