Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical composition. These properties help in identifying and describing materials. Some common physical properties include: 1. **Color**: The color of the material. 2. **Odor**: The smell associated with the substance. 3. **Density**: The mass per unit volume of a substance, typically expressed in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).
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