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<p><font size="2"><span style="font-size: small"><strong>電導(dǎo)率與電阻率的關(guān)系<br /></strong></span><br /></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">由于水中含有各種溶解鹽類，并以離子的形式存在。當(dāng)水中插入一對電極時，通電之后，在電場的作用下，帶電的離子就產(chǎn)生一定方向的移動。水中陰離子移向陽極，使水溶液起導(dǎo)電作用，水的導(dǎo)電能力的強(qiáng)弱程度，就稱為電導(dǎo)</span><span lang="EN-US"><font face="Calibri">(</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">或電導(dǎo)度</span><span lang="EN-US"><font face="Calibri">)</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">，用</span><span lang="EN-US"><font face="Calibri">G</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">表示。</span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin"><font size="3">電導(dǎo)反映了水中含鹽量的多少，是水的純凈程度的一個重要指標(biāo)，水越純凈，含鹽量越少，電阻越大，電導(dǎo)越小，超純水幾乎不能導(dǎo)電。電導(dǎo)是電阻的倒數(shù)，即</font></span></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Calibri">G</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">L/R</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">式中</span><span lang="EN-US"><font face="Calibri">R</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">—電阻，單位歐姆</span><span lang="EN-US"><font face="Calibri">(</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">Ω</span><span lang="EN-US"><font face="Calibri">)</font></span></font></p><p style="margin: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Calibri"><span style="mso-spacerun: yes"> </span>G</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">—電導(dǎo)，單位西門子</span><span lang="EN-US"><font face="Calibri">(S)<span style="mso-spacerun: yes"> </span><span style="mso-spacerun: yes"> </span>1S</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">10<sup>3</sup>mS</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">10<sup>6</sup></font></span><span style="font-family: 宋體">μ</span><span lang="EN-US"><font face="Calibri">S</font></span></font></p><p style="margin: 0cm 0cm 0pt" class="MsoNormal"><font size="3"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">因</span><span lang="EN-US"><font face="Calibri">R</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝ρ</span><span lang="EN-US"><font face="Calibri">L/F</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">，代入上式，則得到：</span> <font face="Calibri"><span lang="EN-US">G</span></font><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">IF/</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">(ρ</span><span lang="EN-US"><font face="Calibri">L</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">)</span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">對于一對固定電極來講，二極間的距離不變，電極面積也不變，因此</span><span lang="EN-US"><font face="Calibri">L</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">與</span><span lang="EN-US"><font face="Calibri">F</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">為一個常數(shù)。令：</span><span lang="EN-US"><font face="Calibri">J</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">L/F</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">，</span><span lang="EN-US"><font face="Calibri">J</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">就稱為電極常數(shù)，可得到</span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Calibri">G</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">I2/</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">(ρ</span><span lang="EN-US"><font face="Calibri">J</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">)＝</span><span lang="EN-US"><font face="Calibri">KI/J</font></span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">式中：</span><span lang="EN-US"><font face="Calibri">K=1/</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">ρ就稱為電導(dǎo)率，單位為</span><span lang="EN-US"><font face="Calibri">S/cm</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">。</span><span lang="EN-US"><font face="Calibri">1S/cm</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">10<sup>3</sup>mS/cm</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">10<sup>6</sup></font></span><span style="font-family: 宋體">μ</span><span lang="EN-US"><font face="Calibri">S/cm</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">。</span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">電導(dǎo)率</span><span lang="EN-US"><font face="Calibri">K</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">的意義就是截面積為</span><span lang="EN-US"><font face="Calibri">lcm<sup>2</sup></font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">，長度為</span><span lang="EN-US"><font face="Calibri">lcm</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">的導(dǎo)體的電導(dǎo)。當(dāng)電導(dǎo)常數(shù)</span><span lang="EN-US"><font face="Calibri">J=1</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">時，電導(dǎo)率就等于電導(dǎo)，電導(dǎo)率是不同電解質(zhì)溶液導(dǎo)電能力的表現(xiàn)。</span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">電導(dǎo)率</span><span lang="EN-US"><font face="Calibri">K</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">，電導(dǎo)</span><span lang="EN-US"><font face="Calibri">G</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">，電阻率ρ三者之間的關(guān)系如下：</span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span lang="EN-US"><font face="Calibri"><span style="mso-spacerun: yes"> </span>K</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">JG</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span lang="EN-US"><font face="Calibri">I/</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">ρ</span></font></p><p style="text-indent: 21pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">式中</span><span lang="EN-US"><font face="Calibri">J</font></span><span style="font-family: 宋體; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">為電極常數(shù)</span></font></p><p style="text-indent: 21.1pt; margin: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class="MsoNormal"><font size="3"><b style="mso-bidi-font-weight: normal"><span style="font-family: 宋體; color: red; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">例如：電導(dǎo)率為</span><span style="color: red" lang="EN-US"><font face="Calibri">O.1</font></span></b><b style="mso-bidi-font-weight: normal"><span style="font-family: 宋體; color: red">μ</span><span style="color: red" lang="EN-US"><font face="Calibri">S/cm</font></span></b><b style="mso-bidi-font-weight: normal"><span style="font-family: 宋體; color: red; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">的高純水，其電阻率應(yīng)為：ρ＝</span><span style="color: red" lang="EN-US"><font face="Calibri">I/K</font></span></b><b style="mso-bidi-font-weight: normal"><span style="font-family: 宋體; color: red; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">＝</span><span style="color: red" lang="EN-US"><font face="Calibri">1/0.1</font></span></b><b style="mso-bidi-font-weight: normal"><span style="font-family: 宋體; color: red; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: minor-latin">×</span><span style="color: red" lang="EN-US"><font face="Calibri">10<sup>6</sup></font></span></b><b style="mso-bidi-font-weight: normal"><span style="font-family: 宋體; color: red; mso-ascii-font-family: Calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋體; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: Calibri; mso-hansi-theme-font: 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