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425.
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A contact thermometer is different from a regular thermometer because of its sensor for the current temperature. Such a thermometer is connected with a heating coild. If the sensor notices that the aimed temperature has been reached the contact thermometer will make the heating coild stop heating. Therefore in an experiment it is possible to have a constant temperature.
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接触式温度计与常规温度计的不同之处在于它的温度传感器。它可以与加热装置连接，当传感器发现温度已升高到设定温度时，它就可以使加热装置停止加热。这种特性使它常应用于恒温槽中。
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Translated by
yuanjiayj
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Reviewed by
yjjart
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426.
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Clamps
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i18n: file: data/tools.xml:194
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钳子
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Translated by
Jeroen T. Vermeulen
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Located in
rc.cpp:2626
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427.
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With clamps as used in a laboratory you can easily hold all kinds of tools.
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i18n: file: data/tools.xml:195
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在实验室中您可以用钳子固定各种工具。
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Translated by
Jeroen T. Vermeulen
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Located in
rc.cpp:1426
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428.
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Litmus Paper
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石蕊试纸
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Translated by
yuanjiayj
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Reviewed by
yjjart
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429.
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There are multiple way to measure the pH-Value of an solution. With a litmus paper it is easy to get a pretty precise pH-Value. The color indicates the value. If you need a more precise value you can for example use a pH-Meter which is using the conductivity of a solution.
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有很多种办法测试溶液的PH值。应用石蕊试纸可以轻易地到一个精确的PH值。试纸的颜色指示了这个值。如果您需要一个更精确的值，您可以使用PH计，它采用的是通过PH电极测量溶液的电导率，并折算出PH值的方法。
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Translated by
yuanjiayj
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Reviewed by
yjjart
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430.
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Short-stem Funnel
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i18n: file: data/tools.xml:204
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短颈漏斗
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Translated by
yuanjiayj
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Reviewed by
yjjart
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Located in
rc.cpp:1432
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431.
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A funnel is used in the laboratory to fill powder into something.
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短颈漏斗在实验室中用于将粉末加入到一些东西中。
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Translated by
yuanjiayj
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Reviewed by
yjjart
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432.
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Buret
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i18n: file: data/tools.xml:209
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滴定管
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Translated by
yuanjiayj
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Reviewed by
yjjart
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Located in
rc.cpp:2638
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433.
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A buret is used to titrate liquids. The buret is filled with a specified volume of a liquid. Below it a container like an Erlenmeyer flask is placed. By opening the valve the liquid in the container will be titrated. High-quality buret have a venting-mechanism with which they can be very easily refilled with the exact volume for which the buret is calibrated.
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i18n: file: data/tools.xml:210
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滴定管用于液体滴定。首先在滴定管中加入一定体积的液体。在它的下方放置一个锥形瓶。只要打开滴定管的阀门，液体就可以滴入锥形瓶。高级的滴定管都有一种抽液功能使它们每次在滴定完毕时可以很精确地将滴定液加到精确的刻度。
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Translated by
yuanjiayj
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Reviewed by
yjjart
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Located in
rc.cpp:1438
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434.
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Beaker
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i18n: file: data/tools.xml:214
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烧杯
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Translated by
yuanjiayj
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Reviewed by
yjjart
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Located in
rc.cpp:2642
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