Here are 5 physical properties, with a brief explanation of each:

1. Color: The way an object appears to the human eye, determined by the wavelengths of light it reflects.

2. Density: The amount of mass per unit volume of a substance. This tells you how tightly packed the matter is.

3. Melting Point: The temperature at which a solid changes into a liquid.

4. Boiling Point: The temperature at which a liquid changes into a gas.

5. Solubility: The ability of a substance to dissolve in another substance, usually a liquid.