The properties related to the state (gas, liquid, or solid) orappearance of a sample are called physical properties. Some commonlyknown physical properties are density (density = mass/volume), stateat room temperature, color, hardness, melting point, and boiling point.The physical properties of a sample can usually be determined withoutchanging its composition. Many physical properties can be measured anddescribed in numerical terms, and comparison of such properties is oftenthe best way to distinguish one substance from another.
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