This law states that the ratio of a metal's thermal conductivity k to its electrical conductivity σ is a constant at a constant temperature T , regardless of the type of metal. It was discovered experimentally in 1853. When calculations are made assuming that both the thermal and electrical conduction of metals are due to free electrons, k /σ T approximately becomes a universal constant, which is called the Wiedemann–Franz constant. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
金属の熱伝導率kと電気伝導率 σ との比は金属の種類によらず,一定温度 T で一定の値をもつという法則。 1853年に実験的に発見された。金属の熱伝導も電気伝導も自由電子によると考えて計算すると,k/σT は近似的に普遍定数となり,これをウィーデマン=フランツの定数という。
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