初中物理及化学中,都有碘升华的实验,初二物理中同时还学习凝华的知识。沪教版初二物理教材中,做演示实验时,升华现象很明显,但是观察到凝华现象却需要较长时间。为了克服此缺陷,我们对该实验设计进行了改进,实验现象明显改善,从而提高了教学效果。具体改进方法如下。方法一:将 In junior high school physics and chemistry, there is an experiment of iodine sublimation. In the second year of physics, we also learned the knowledge of desublimation. In the physics textbook for the second edition of Shanghai Jiaotong University, the demonstration of sublimation was obvious during demonstration experiments, but it took a long time to observe the phenomenon of desublimation. In order to overcome this defect, we improved the design of the experiment, and the experimental phenomena were significantly improved, thereby improving the teaching effect. The specific improvement method is as follows. Method one: will