Here's why:

* Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical composition.

* Boiling point is the temperature at which a liquid changes into a gas. This change of state is a physical change, not a chemical change. The substance itself doesn't change its chemical makeup, just its state of matter.

Examples of other physical properties:

* Color

* Density

* Melting point

* Hardness

* Odor

* Texture

Let me know if you have any other questions!