define thermal expansion
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ᕼᗴᖇᗴ Ꭵᔕ Ƴᗝᑌᖇ ᗩᑎᔕᗯᗴᖇ
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Thermal expansion is the tendency of matter to change its shape, area, and volume in response to a change in temperature. 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.
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thermal expansion means the increase in area, volume and length .
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