How does thermal conductivity incrase with incrase in cross section?
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thermal conductivity is directly proportional to cross sectional area of the conductor
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In metals, heat conductivity is primarily due to free electrons. ... In pure metals the electrical conductivity decreases with increasing temperature and thus the product of the two, the thermal conductivity, stays approximately constant.
Thermal conductivity of liquids decreases with increasing temperature as the liquid expands and the molecules move apart. In the case of solids, because of lattice distortions, higher temperatures make it difficult for electrons to flow, hence the thermal conductivity of metals decreases.
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