“密度”是同学们遇到的第一个表征物质特性的物理量 ,它是初中物理最重要的概念之一 ,掌握了这一概念 ,不仅为灵活运用密度知识解决问题提供了保证 ,还为后面学习液体的压强、浮力等知识奠定了基础。那么 ,应该怎样去理解密度呢 ?　　 一、密度的来龙去脉同学们认真阅读课文就 “Density” is the first physical quantity that the students met to characterize the physical properties. It is one of the most important concepts of junior high school physics. Having grasped this concept, it not only provides a guarantee for the flexible use of density knowledge to solve problems, but also serves as Learning the liquid pressure, buoyancy and other knowledge laid the foundation. Then, how should we understand the density? First, the ins and outs of density Students carefully read the text