A piece of iron is heated till it become...

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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### Step-by-Step Solution: 1. **Understanding the Process**: When a piece of iron is heated, it becomes red-hot. This indicates that the iron is undergoing a physical change due to the application of heat. 2. **Softening of Iron**: As the iron heats up, it becomes soft and malleable. This means that it can be easily shaped or molded into different forms. 3. **Molding the Iron**: The soft iron is then beaten into a desired shape. This shaping process is also a physical change, as it does not alter the chemical composition of the iron. ...

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Stephen's law

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Kirchoff's law

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