在所有版本的初中物理教材中,“升华与凝华”一节中的典型实验都采用了碘这种物质来演示升华与凝华实验。在初中物理教学过程中,笔者对碘的升华与凝华实验进行了多次改进尝试,以使这个实验可见度更大,对人体的影响更小。第一种方法是在锥形瓶中放入一根棉线,接着加入碘,塞上塞子,然后用酒精灯对其微微加热, In all versions of junior high school textbooks, typical experiments in the Sublimation and Condensation section use iodine as a substance to demonstrate sublimation and desublimation experiments. In the process of junior high school physics teaching, I made several attempts to improve iodine sublimation and desublimation experiments to make this experiment more visible and less impact on the human body. The first method is to place a cotton thread in a conical flask, then add iodine, stoppered, and then gently heat it with an alcohol lamp,