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Why does an iron work only when it is hot?

Why does an iron work only when it is hot?An iron can be worked even when it’s not hot. However, it becomes softer when heated, so working on cloth becomes easy. When iron, like any other metal, is heated, it absorbs energy which excites its molecules. This makes the metal softer. This property was known to ancient craftsmen and is used even today in producing iron implements.

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