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In metals, thermal conduction results from the motion of free electrons, and there is close correspondence between thermal conductivity and electrical conductivity. In solids that are poor conductors of electricity and in most liquids, thermal conduction results from momentum transfer between adjacent vibrating molecules or atoms. In gases, conduction occurs by the random motion of molecules, so that heat is “diffused” from hotter regions to colder ones.

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出自：乐山师范学院专业英语 A卷

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