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初中物理第一册课本 (华东版 )第 59页有一个演示实验 ,如图 1所示 ,目的是让学生知道液化时放热。通过实验说明 :水蒸气在试管中遇冷会液化 ,容器B的水温升高 ,说明水蒸气液化时要放出热量。但是在实际的教学中 ,我感到这个实验有一些不足这处 :1 .实验完成所用的时间太长。实
There is a demonstration experiment on the 59th page of the textbook for junior high school physics (East China Edition), as shown in Figure 1, which aims to let students know that there is heat release during liquefaction. According to the experiment, the water vapor in the test tube will liquefy, and the water temperature in the container B will increase, which means that the water vapor will release heat when it liquefies. However, in actual teaching, I feel that there are some shortcomings in this experiment: 1. The experiment took too long to complete. real