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Thermal conduction
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Heat transport consists of two alternating processes. On one hand, there is conduction through a medium, and on the other, the transfer of heat from one medium to another.
Transport through a medium involves the transfer of heat into the medium, followed by conduction through it, and finally, the transmission of heat out of the medium. In more complex media, multiple stages of conduction and transfer between different media must be considered. If heat is generated or absorbed in one of the media, conduction from or to that heat source or sink is accounted for.
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