义务教育课程标准化学教科书第七单元介绍了粉尘爆炸实验:“剪去空金属罐和小塑料瓶的上部,并在金属罐和小塑料瓶的底侧各打一个比橡皮管外径略小的小孔……从橡皮管的一端快速鼓入大量空气,使面粉充满罐,观察现象并分析原因。”按照课本图例师生制作了一批教具,效果差强人意。原因是金 The seventh unit of the Compulsory Education Curriculum Standard Chemistry Textbook describes the dust explosion experiment: “Cut the upper part of the empty metal cans and small plastic bottles, and make a smaller diameter than the outer diameter of the rubber tube on the bottom side of the metal cans and small plastic bottles. The small hole... quickly blows in a lot of air from one end of the rubber tube to make the flour full of cans, observe the phenomenon and analyze the reasons.” According to the textbook legend, teachers and students produced a number of teaching aids, and the results were unsatisfactory. The reason is gold