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汽体液化放热这一演示,如果照初二物理教科书上图177那样做,同学在很短的时间内难以看出液化放热的效应。如果在冷凝杯中放一枝温度计,也仅是少数一二人能够观察到,同时还需较长的时间。我是这样来做这个实验的:不用烧杯作为冷凝杯,而用下小上大的量杯,目的在于少盛冷水,然后在量杯里,放一个空试管(内部装少数铅粒使下沉竖立水中),用带有细玻璃管的橡皮塞把试管口塞紧,再在细玻璃管中注入着色水柱,这样便成功一个空气温度计。当液化开始有半分钟的样子即可看
The demonstration of liquefaction of the vaporization of liquefied gas, as shown in Figure 177 on the second physical textbook, made it difficult for students to see the effect of liquefaction on a very short period of time. If you put a thermometer in the condensing cup, only a few one or two people can be observed, but also take a long time. I did the experiment in this way: Instead of using a beaker as a condenser cup, use a small measuring cup with the purpose of reducing the amount of cold water and then placing an empty test tube in the measuring cup ), With a rubber tube with a thin glass tube plug test tube mouth, and then into the thin glass tube colored water column, so that success of an air thermometer. When liquefied for half a minute you can see