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关于密度的测量,根据选择原理和器材的不同可以有多种不同的方法。能不能灵活地运用不同方法来测定物质的密度,既能反映出学生对整个初中力学知识的理解程度,还能反映出学生综合运用知识解决问题的能力及创新思维能力的发展水平。正因如此,密度测量的题目尤其是开放型、设计型考题成为近年来中考的持续性热点。尽管测量物质密度的方法很多,但如果我们对这些方法进行认真的分析和归纳就会发现,其中多数方法(尤其是固体密度测量的方法)的实验原理都可归结为密度的定义式。那么,如何从密度的定义式出发去设计测量密度的实验方案
With respect to the measurement of the density, there are many different methods depending on the selection principle and the equipment. The flexibility to use different methods to determine the density of a substance can not only reflect students’ understanding of the overall knowledge of junior middle school mechanics, but also reflect the students’ ability to use knowledge to solve problems and the level of creative thinking. For this reason, the topics of density measurement, especially open and design-type exams, have become a continuing hot spot in recent years. Although there are many methods for measuring the density of substances, if we carefully analyze and summarize these methods, we will find that the experimental principle of most of them (especially the method of solid density measurement) can be attributed to the definition of density. So, how to design the experimental scheme of measuring density from the definition of density