1. Color: The visual appearance of a substance, determined by the wavelengths of light it reflects. (Example: Gold is yellow)
2. Density: The ratio of a substance's mass to its volume. (Example: Water is less dense than oil, which is why oil floats on water)
3. Boiling Point: The temperature at which a substance changes from a liquid to a gas. (Example: Water boils at 100°C (212°F))
4. Melting Point: The temperature at which a substance changes from a solid to a liquid. (Example: Ice melts at 0°C (32°F))
5. Solubility: The ability of a substance to dissolve in another substance. (Example: Salt is soluble in water)
6. Conductivity: The ability of a substance to conduct heat or electricity. (Example: Copper is a good conductor of electricity)
Important Note: Physical properties can be observed or measured without changing the chemical composition of the substance.
