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12 November, 09:52

True or false: the coefficient of thermal expansion governs the way a substance expands or contracts when it is heated or cooled

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  1. 12 November, 12:58
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    It is true because Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature, through heat transfer. Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin moving more and usually maintain a greater average separation.
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