取烧瓶一个，胶塞一只，向瓶内装入几粒（约米粒大小）碘，盖好胶塞后可手持瓶颈部在酒精灯上适度晃动加热。晃动的目的一是不让碘粒停留在瓶底某部集中受热发生熔化，更有趣的是使碘粒在晃动时与瓶内壁接触发出声响，从而证实碘仍是固态存在，但就在发声的同时，紫色的碘蒸气 Take one flask, fill one with plastic stopper, and fill the bottle with a few grains (about grain size) of iodine. After covering the rubber stopper, hold the bottle neck and gently heat it on the alcohol lamp. The first purpose of shaking is to keep the iodine particles from melting in a certain part of the bottom of the bottle, and it is more interesting to make the iodine particles make contact with the inner wall of the bottle when it shakes. This proves that the iodine is still in the solid state, but it is sounding. At the same time, purple iodine vapor