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Thermal expansion
Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature,〔 when the body is heated its dimension(size) increase.This increase in dimension is called thermal expansion .
〕 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. Materials which contract with increasing temperature are unusual; this effect is limited in size, and only occurs within limited temperature ranges (see examples below). The degree of expansion divided by the change in temperature is called the material's coefficient of thermal expansion and generally varies with temperature.
==Overview==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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