電導率
電導率（electrical conductivity）或比電導（specific conductance），傳電流強弱之測值也，電阻率 ρ 倒數也。國際單位制西門子每公尺（S·m-1）曰： σ = 1 ρ \,\!} 。
施電壓導體端，其電荷載子流之即成電流。電導率乃歐姆定律定之電流密度及電場強之 。
物異向性（anisotropic）之率需矩陣闡之，即第二階張量，常對稱矩陣也。
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