What do you understand by thermal expansion of a substance?
ICSE Class 9 Physics Chapter Heat and Energy
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Thermal expansion occurs when an object expands and becomes larger due to a change in the object's temperature. ... Temperature is the average kinetic (or movement) energy of the molecules in a substance. A higher temperature means that the molecules are moving faster on average.
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thermal expansion
the increase of shape , side, volume due to the heat of an object is called thermal expansion
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