Magnetism is considered a physical property because it can be observed and measured without changing the substance itself. Physical properties are characteristics that can be identified through physical changes rather than chemical changes.
When we discuss magnetism, we refer to the ability of a material to exert a magnetic force. This force can attract or repel certain materials, including iron and other ferromagnetic substances. The magnetic property arises due to the alignment of electrons in the atoms of these materials.
For example, when a magnet is brought close to a metallic object, the object may either be attracted to or repelled from the magnet. This interaction can be observed without altering the chemical structure of either the magnet or the metal. Hence, magnetism can easily be tested and demonstrated, making it a prime example of a physical property.
In contrast, if we were to combust a material, that would constitute a chemical change, altering its chemical composition and resulting in the production of new substances. This distinction emphasizes why magnetism is categorized as a physical property; it involves observable phenomena that do not alter the fundamental nature of the material involved.