A physical change is a type of change that affects one or more physical properties of a substance without altering its chemical composition. During a physical change, the appearance, state, or phase of a substance may change, but the substance itself remains the same at the molecular level. Examples of physical changes include melting ice into water, boiling water to form steam, dissolving sugar in water, and breaking a glass. These changes are generally reversible, meaning the original substance can often be restored by reversing the process.
Define physical change:
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