Physical changes only affect a substance's physical characteristics—such as condition, shape, size, and color—and no new substances are created, so, they are typically reversible. On the other hand, the concept of microscopic reversibility limits the number of chemical changes that can be reversed. It implies that every collision and change at the level of atoms and molecules can occur in both directions. That is why only some chemical reactions are reversible.
Why is it simpler to undo physical changes than chemical ones?
Physical changes, like melting or boiling, are usually simple to undo even though the final result might not always look exactly the same as the original. Aside from gaining or losing energy, particles do not change during physical changes and no new materials are created.
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