第七章 质量和密度 1 教材特点 本章讲述质量和密度两个重要物理量.第一节介绍质量.第二节做“用天平称固体和液体质量”的实验.第三、四、五节是“密度”、“实验:用天平和量筒测定固体和液体的密度”、“密度知识的应用”.和原教材相应部分比较,本章具有以下特点. Chapter VII Quality and Density 1 Characteristics of Teaching Materials This chapter describes two important physical quantities: quality and density. The first section introduces the quality. The second section does the experiment of “using the scale to weigh the solid and liquid quality.” The third, fourth and fifth sections are “ “Density,” “Experiment: Density of solids and liquids measured with balances and graduated cylinders,” “Application of density knowledge.” Compared to the corresponding parts of the original textbook, this chapter has the following features.