Question

A piece of iron is heated till it becomes red-hot. It then becomes soft and is beaten to a desired

shape. What kind of changes are observed in this process– reversible or irreversible?

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Answer 1

Answer:

irreversible change

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Answer 2

Answer:

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Explanation:

IT IS A REVERSIBLE CHANGE. IF WE HEAT THE IRON AGAIN AND BEND IT BACK TO ORGINAL SHAPE WE GET THE IRON PIECE BACK. WE HAVE TO BE CAREFUL NOT TO QUENCH THE IRON [ QUENCH MEANS COOLING THE IRON SUDDENLY FROM HEATING BY DIPPING IN WATER]

QUENCHING WILL CHANGE THE GRAIN STRUCTURE AND MAKE IT IRREVERSIBLE.

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