Boiling water is considered a physical change because the process can be reversed. In boiling, water transitions from a liquid state to a gas state (steam) due to the addition of heat. Once the heat source is removed, the steam can cool down and condense back into liquid water. Unlike chemical changes, where new substances are formed and cannot be easily reversed, the boiling of water involves a change in state but not in the chemical composition of the water itself.
Why is boiling water a physical change?
The process releases energy.
The process moves atoms into permanent places.
The process can be reversed.
The process creates a new substance.
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