what is a physical change
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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. ... Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
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A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible.
The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.
Physical changes are not to be confused with chemical changes, which form whole new substances.
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