What is an example of a physical change?

A physical change is a process that alters the form or appearance of a substance but does not change its chemical composition. In the case of melting ice, the process involves ice (solid water) absorbing heat and transforming into liquid water. This change in state from solid to liquid does not affect the molecular structure of water; it remains H2O in both forms.

Other examples of physical changes include dissolving sugar in water or breaking a glass. These changes can typically be reversed, unlike chemical changes, which result in new substances being formed. For instance, freezing the melted ice will revert it back to its original solid state.