Physical-change
noun, Chemistry.
1.
a usually reversible change in the physical properties of a substance, as size or shape:
Freezing a liquid is a physical change.
noun
any process involving a substance’s change from one state (gas, liquid, solid) to another without alteration of the chemical composition; cf. chemical change
Examples
Freezing water is a physical change because both water and ice are H2O.
See chemical change
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