What Are Reversible And Irreversible Changes

What are reversible and irreversible changes ? Give one example for each.

  1. Reversible change : When a change in a substance can be reversed by changing the conditions, it is said to be a reversible change.
    Example : Melting of ghee or wax.
  2. Irreversible change : When a substance can not be brought back to its original state after a change, it is said to be an irreversible change.
    Example : Souring of milk.