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问题发现:在给学生讲解计算物质密度的多种题型中,我发现,通过给固定的容器中灌水来求解未知物质密度的题目,不少学生在解答起来存在一定的困难。究其原因,是没有透彻理解注水前后的关键是弄清楚题目当中的体积变化,就能使问题迎刃而解了。这样泛泛而谈同学们肯定不容易接受和
Problem finding: In explaining various types of questions for students to calculate the density of matter, I found that solving the problem of the density of unknown matter by filling a fixed container with water has caused many students to have difficulties in answering questions. The reason is that the key to understanding the volume before and after the water injection is to understand the volume change in the problem. This will solve the problem. This kind of general discussion of the students is certainly not easy to accept and