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A physical change is when a substance undergoes a process whereby its physical features change but its chemical features stay the same.

A chemical change is when an object undergoes a process whereby its chemical composition changes.

The water leaving as steam has undergone a physical change (evaporation) from a liquid state to a gaseous one, but no chemical change has occurred because it is still H2O. By definition, any change in the state of matter is a physical change.

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10y ago

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