华东版初二物理新教材对晶体熔化实验做了一些改进,以前教材中这个实验是用海波做的,由于实验操作难度较大,教师也很难成功地做好这个实验.新教材改用冰取代海波,可以避免这些因素的干挠.但冰的熔点较低,这节内容教学时间上安排在秋季,我们华东地区此时气温普遍较高。而书中采用普通水浴加热法,由于 The new physical textbook of East China Version 2 has made some improvements to the crystal melting experiment. In previous textbooks, this experiment was done with Haibo. Because the experimental operation is difficult, it is difficult for teachers to successfully do this experiment. The new textbook is used instead. Replacement of sea waves with ice can avoid these factors. However, the melting point of ice is low. This section of teaching time is arranged in the fall. At this time, temperatures in East China are generally higher. The book uses ordinary water bath heating method, because