Which is not an example of a physical property of a material?

Reactive properties of a material do not classify as a physical property. Physical properties are characteristics that can be observed or measured without changing the identity of the substance. These include traits such as color, boiling point, and odour, which describe the material's appearance or physical state under certain conditions. Reactive properties, however, refer to how a substance interacts with other substances, which typically involves a change in chemical composition. This distinction is crucial for understanding material behavior in various applications, particularly in fields like engineering, where knowing how materials will react under different conditions is vital for safety and efficiency.