现行初中物理课本第二册73页,关于萘熔解的实验,对于学生了解晶体、非晶体的概念,掌握晶体熔解与凝固的规律具有很重要的作用。但是课本所示的实验装置小,可见度低,如图1所示。做演示时学生几乎看不到温度计的刻度。我们在教学中对此装置进行了一点改进。如图2所示,将液体温度计换成热敏温度 The current junior high school physics textbook second volume 73 pages, about naphthalene melting experiments, for students to understand the concept of crystal, non-crystal, to master the law of crystal melting and solidification has a very important role. However, the experimental device shown in the textbook is small and its visibility is low, as shown in Figure 1. Students do not see the scale of the thermometer when doing the demonstration. We have made some improvements to this device in our teaching. As shown in Figure 2, replace the liquid thermometer with a thermal temperature