Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.

Sl. No.	Change	Can be reversed (Yes/No)
1	The sawing of a piece of wood
2	The melting of ice candy
3	Dissolving sugar in water
4	The cooking of food
5	The ripening of a mango
6	Souring of milk

Changes in the shape/nature of an object can be of two types. They are reversible changes and irreversible changes.

a) The changes in which the object/matter can be brought back to its original state are known as reversible changes.

    e.g., melting of wax, stretching of a rubber band, etc.

b) The changes in which the object/matter cannot be brought back to its original state are called irreversible changes.

    e.g., burning of wood, cooking of food, etc.

Thus,