what did we obserbee when heat airon rod give reason
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When a metal rod is heated it expands because its atoms start moving faster, “vibrating”. As they vibrate, they push nearby atoms a little more than they used to do, pretty much using more space than they usually do. Hence the distance among its atoms increases.
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We observe that the iron rod expands (not too much but it does if we observe with a microscope or magnifying glass).
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