密度在物理学中是一个十分重要的物理量,它不仅是我们认识物质世界的一个起点,也是我们辨别物质的一个重要手段。在接触密度概念之前,同学们经常会有“铁块比木头重,木头又比棉花重”的错误看法。因此,能否掌握好密度知识是日后学习浮力及压强的关键,并且密度的测量,既是一种 Density is a very important physical quantity in physics. It is not only a starting point for us to understand the material world, but also an important means for us to identify matter. Before contacting the concept of density, students often have the wrong view that “iron is heavier than wood and wood is heavier than cotton.” Therefore, whether the knowledge of density can be mastered is the key to learning buoyancy and pressure in the future, and the measurement of density is both a