Question

Is there any example of physical change which is not reversible?

Answer 1

If we tear a paper, the chemical composition remains the same. But physically the shape of the object is altered. Breaking of glass. You cannot stick it to form the original shape.

Answer 2

But, don't get fooled into thinking that all physical changes are irreversible. In fact, many physical changes can be reversed. Remember that when a substance changes physically, it is still the same substance, just in a different form. Water turning into ice is a great example of a reversible physical change.