What is a physical property?

A physical property is indeed defined as a characteristic that can be observed or measured without changing the composition of the material. This is crucial because it means that physical properties can be determined without altering the substance itself. For example, properties such as color, density, boiling point, and melting point can all be observed or measured without transforming the material into a different substance.

This contrasts with properties that involve a change in composition, such as chemical reactions, which would not qualify as physical properties. Understanding physical properties is essential for identifying materials and understanding their behavior in different contexts, which is foundational in physical science.