“质量和密度”是初中物理的重点,也是中考物理的重要考点之一,本章知识在中考命题中主要考查如下两个方面:第一,知道质量的单位,会调节天平,会用天平称物体的质量.第二,理解密度的概念,会查密度表,知道水的密度,会用天平和量筒测固体和液体的密度.同学们在学习这些知识点的时候,往往会出现种种错误,现归类剖析如下: 一、利用天平称物体质量时。读错游码的示数例1 使用托盘天平称物体的质量时,应将被测物 “Quality and Density” is the focus of junior high school physics, and is also one of the important test points in the physical examination. This chapter’s knowledge examines the following two aspects in the examination proposition: First, the unit that knows the quality will adjust the balance, and will use the balance. The second is to understand the concept of density. Secondly, to understand the concept of density, to check density tables, to know the density of water, and to measure the density of solids and liquids with balances and graduated cylinders. When students learn these knowledge points, they often have all kinds of errors. , is classified as follows: First, the use of scales when the object quality. Example of Reading Error Code Example 1 When using a pallet scale to weigh the mass of an object, the object to be measured should be