Question

A piece of iron is heated till it becomes red-hot. It then becomes soft and is beaten to the desired shape. What kind of changes are observed in this process– reversible or irreversible?

Answer 1

A piece of iron on heating can be beaten into the desired shape.

• In the above process only the shape of the iron changes.
• The original shape can be obtained back again through heating, beating into the desired shape and cooling.

Therefore, the above process is a reversible change.