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“升华和凝华”在初中物理教材中有阐述但属一般了解的、非重点内容。教学中要求学生了解升华、凝华现象及升华时吸热、凝华时放热。听了几位教师的课后,感到有几个问题需要澄清,现提出来,请大家探讨。一、碘的升华、凝华实验的可见度问题要使学生了解升华凝华现象,掌握定义中“直接变成”四个字的含义,实验成功与否是本节课的关键。教师一般均按教学参考书(人教社编,1987年版)提供的方法进行
“Sublimation and Sublimation” are described in junior middle school physics textbooks but are generally understood and non-critical. In teaching, students are required to understand sublimation, sublimation, and absorption during sublimation and exogamation during sublimation. After listening to the lectures of several teachers, I felt that there were several issues that needed to be clarified. First, the sublimation of iodine, the issue of the visibility of the desublimation experiment must enable students to understand the phenomena of sublimation and sublimation, and grasp the meaning of the four words “directly” in the definition. The success of the experiment is the key to this lesson. Teachers generally follow the methods provided in the reference books for teaching (Education Society, 1987 edition).