* No new substances are formed: Polishing removes surface imperfections and scratches, but it doesn't change the chemical composition of the metal. The metal remains the same type of element.

* Change in appearance only: Polishing alters the metal's surface, making it smoother and shinier. The change is mainly in its physical appearance, not its chemical makeup.

* Reversible: In many cases, the polished surface can be scratched or damaged, returning the metal to its previous state. This reversibility is another hallmark of a physical change.

Example: Polishing a silver spoon doesn't turn it into a different element. It simply removes tarnish and makes it more reflective.

Let me know if you have more questions!