Reversible and irreversible changes

• Reversible change are change that can be undone. It mean you can change something back to how it was before.
• Irrevisable change I change that cannot be undone.Once these changed happen, You cannot go back to how things were before.
• Heat make substance change
• Some changes are reversible,

  For example melting,and refreezing
• Some charges are irreversible,

  For example,burning a match.