Explain how a metal rim is fixed around the wooden wheel of a cart.
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Metal rim is made slightly smaller than the wooden wheel. On heating rim expands and fits into wheel. Cold water is then poured over rim, which contracts and fits tightly onto the wheel.
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The metal rim gets heated to fix it on to a cart because metal rims are made slightly smaller.
On heating, the rim expands and fits on to the wheel. Then on cooling, the rim contracts and fits slightly on to the wheel.
It is a physical process. Physical process is a sustained phenomenon or one marked by gradual changes through a series of states.
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