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晶体的熔化和凝固实验多年来一直是初中物理教学中的难点,经多次实验发现“纯净水”做熔化和凝固实验效果良好,且取材方便。我们将演示实验改为课上学生实验,取得了很好的教学效果。现将实验过程说明如下:(实验在21℃的室温下进行)1 熔化实验将“纯净水”在冰箱中冻成冰,取出后砸成小颗粒状,温度为-5℃～-2℃,取15g～20g放入试管中,再将试管架在烧杯中。将温度计插入试管的冰中,并不断搅拌,使冰在空气中熔化,熔化过程记录如表1:
The melting and solidification experiment of crystals has been a difficult point in junior high school physics teaching for many years. After many experiments, it has been found that the “pure water” has good melting and solidification experiments, and it is easy to obtain materials. We changed the demonstration experiment into a student experiment in class and achieved a very good teaching effect. The experimental process will now be described as follows: (The experiment is carried out at room temperature of 21°C) 1 Melting experiment The “pure water” is frozen in ice in the refrigerator, and then taken out into small pellets, the temperature is -5 °C ~ -2 °C, take 15g ~ 20g into the test tube, and then put the tube in a beaker. Insert the thermometer into the ice of the test tube and stir constantly to melt the ice in the air. The melting process is recorded in Table 1: