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| Figure 2.2.18.-1. – Apparatus for the determination of freezing pointApparatus. The apparatus (see Figure 2.2.18.-1) consists of a test-tube about 25 mm in diameter and 150 mm long placed inside a test-tube about 40 mm in diameter and 160 mm long. The inner tube is closed by a stopper which carries a thermometer about 175 mm long and graduated in 0.2 °C fixed so that the bulb is about 15 mm above the bottom of the tube. The stopper has a hole allowing the passage of the stem of a stirrer made from a glass rod or other suitable material formed at one end into a loop of about 18 mm overall diameter at right angles to the rod. The inner tube with its jacket is supported centrally in a 1 litre beaker containing a suitable cooling liquid to within 20 mm of the top. A thermometer is supported in the cooling bath. |
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我來幫您一把!且看我的免費譯文如下(字數(shù)太多的話,可要收費啦,嘿嘿): 圖 2.2.18.-1. – 凝固點測量裝置。該裝置(見圖2.2.18.-1)包括兩個試管,一個內(nèi)管,一個外管,內(nèi)管直徑約25毫米,長 150 毫米,外管直徑約40 毫米,長160 毫米,內(nèi)管放在外管里面。內(nèi)管封有一只管塞,管塞固定有一個大約175毫米長而分度為0.2 °C 的溫度計,使得溫度計球部約在內(nèi)管底以上15 毫米處。管塞有一個開孔,可插入一根玻璃或其它合適材料制成的攪拌棒,其一端被加工成總體直徑約18毫米的環(huán)形并與攪拌棒成直角。在一個1升燒杯的中心,安裝內(nèi)管及其夾套,該燒杯盛有一種合適冷卻液,液位至燒杯頂不大于20毫米。在冷卻浴中安裝一個溫度計。 |

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