Change that doesn't lead to formation of new substance. What does this mean

Answer 1

When something undergoes a change that doesn't lead to the formation of a new substance, it means that the original substance is still present after the change, but its physical state or arrangement may have been altered. These changes are often referred to as physical changes. Examples of such changes include changes in state (i.e., solid to liquid to gas), changes in shape or size (e.g., cutting or grinding), or changes in temperature or pressure. In contrast, changes that result in the formation of new substances are referred to as chemical changes or reactions, where the original substances are transformed into different substances with different properties.