What is the difference between expansion …
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Meghna Thapar 6 years ago
When an object is heated, it increases in size thus expansion takes place on heating. When the hot object is cooled, it decreases in size and comes back to the original size by contraction.
Example - Fixing of iron rim to the wooden wheel of a cart:
The iron rims are fitted around wooden wheels by the process of expansion on heating.
The iron rim is made slightly smaller than the wooden wheel. The rim is then uniformly heated which expands on heating and becomes bigger in size. It is then put around the wooden wheel and allowed to cool. The iron rim contracts on cooling and thus fits tightly on the wooden wheel.
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