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水中的離子含量也就是導電物質的總含量,可用電子導電率來加以表示。電子導電率,即電子流動“容易”的程度,與水中離子含量成正比關係。而阻抗值(=比阻抗值)則表示電子流動“困難”的程度,其值隨著水中離子含量減少而增加。因此,比阻抗值與導電率呈倒數關係。由於自來水、蒸餾水中含有較多的離子,因此以導電率來表示,而超純水所含離子較少,以比阻抗值來表示。檢測原理是,在水中將距離 1 cm 的兩片表面積為 1 cm2 大小的電極加以通電,來檢測兩極間的導電率與電阻值,其單位表示如下。