PATHOLOGY

Detailed explanation-1: -Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance.

Detailed explanation-2: -When a material undergoes a change in shape, size or state it is called a physical change. Generally, no new substance is formed in a physical change. For example change of state of water from solid to liquid or liquid to gas is a physical change as only state of water is changing and no new substance is formed.

Detailed explanation-3: -Physical changes result only in a change in the form (i.e., solid, liquid, gas) or appearance of a substance, but not the chemical composition of the substance. The substance will still ultimately be the same. Once a physical change occurs, it can be reversed.