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现行物理教学大纲(修订本)规定:演示碘的升华和凝华实验(也见初中物理课本第二册第85页)。通常的方法是把少量的碘放进烧瓶里,用酒精灯加热,固态碘升华,产生紫色的碘蒸气。停止加热后,碘蒸气会在烧瓶壁上凝华成固态碘。
The current physics syllabus (revised edition) stipulates: Demonstrate sublimation and desublimation experiments of iodine (see also junior high school physics textbook second volume, p. 85). The usual method is to put a small amount of iodine into the flask and heat it with an alcohol lamp. The solid iodine sublimates to produce purple iodine vapor. After heating is stopped, the iodine vapor decomposes into solid iodine on the wall of the flask.