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布朗运动是分子热运动的有力证明。但由于实验必须在显微镜下观察,不仅费时而且较难做。我校五、六十年代都是只由教师口头讲述,学生看课本上的图,不进行实验。布朗运动到底是什么样的,学生只凭想象。前几年改为先讲课,后安排学生轮流到显微镜下观察。这样,讲课时学生没有感性认识,观察时又得不到适当的指导。很多同学看了课本上的图,没有仔细阅读课本上的说明(每两点间相隔30秒),误认为布朗运动象
Brownian movement is a strong proof of molecular heat movement. However, because the experiment must be observed under a microscope, it is not only time-consuming but also difficult to do. My school in the 1950s and 1960s was only spoken verbally by teachers. Students looked at the pictures on the textbooks and did not conduct experiments. What exactly is the Brown movement? Students only rely on their imagination. In previous years, I changed to lectures first, and then I arranged for students to take turns to observe under the microscope. In this way, students did not have perceptual knowledge when they lectured, and they were not given proper guidance when they observed. Many students looked at the diagrams in the textbooks and did not read the instructions in the textbooks carefully (each 30 seconds apart), mistaken for Brown