Here's why:

* Physical Properties: Describe a substance's appearance, texture, and how it behaves under certain conditions. These properties can be observed or measured without changing the substance's chemical composition.

* Chemical Properties: Describe how a substance reacts with other substances or how it changes its chemical composition.

Volatility refers to how easily a substance changes from a liquid to a gas. It's determined by factors like:

* Intermolecular Forces: The strength of the attraction between molecules. Substances with weak intermolecular forces are more volatile.

* Temperature: Higher temperatures provide more energy for molecules to escape the liquid phase.

* Pressure: Lower pressure allows for easier vaporization.

Since volatility doesn't involve changing the substance's chemical makeup, it falls under the category of a physical property.