Question

Are all physical changes are reversible? if not, give an example of a physical change that is not reversible.

Answer 1

Physical Changes: A change that alters some specific physical property of the matter, like its state, texture, magnetic or electrical conditions or color without causing any change in the composition of its molecules, is called physical change, they generally get reversed, if the cause producing the change is removed.

But all physical changes are not reversible. Chopping wood for the fire is an example of a physical change that is not reversible since pieces cannot be put back together to form the tree.