Alberta Boilers Safety Association (ABSA) Practice Test 2025 - Free ABSA Practice Questions and Study Guide

Density is classified as a physical property because it describes the mass of a substance per unit volume and can be observed without changing the substance's chemical identity. Physical properties are characteristics that can be measured or observed without altering the composition of the material, such as boiling point, melting point, and solubility. Since density is dependent on the material’s mass and volume, it remains unchanged during physical changes, further underscoring its classification as a physical property.

In contrast, chemical properties relate to the ability of a substance to undergo chemical changes, distinguishing it from physical properties. Thermal properties would pertain to a material's response to heat, such as thermal conductivity or specific heat, while electrical properties involve how a substance responds to electric fields or currents. Therefore, density's nature as a relationship of mass to volume aligns it firmly within the realm of physical properties.