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“密度”是中学物理中一个重要的物理量,在初中物理教学中占有重要位置.在初中物理课本中物质密度的定义是:“某种物质单位体积的质量叫做这种物质的密度.”在整个初中物理教材中有好几处都涉及到物质的密度,如压强和浮力这两部分内容,用到密度的知识就比较多.由这些知识点通过分析归纳得出一些求物质密度的方法.现归纳如下:一、定义法1.这种方法是根据密度的定义来求物质的密度的.只要知道了某种物质的质量mm和体积V,就可以求出密度ρ.即ρ=.V例1有一铜块质量为8.9千克,测得其体积为1分米3,试
“Density ” is an important physical quantity in high school physics, and plays an important role in junior high school physics teaching. The definition of material density in junior high school physics textbooks is: “The mass of a certain material unit volume is called the density of this material. ”In the entire junior high school physics textbook there are several related to the material density, such as pressure and buoyancy in these two parts, the density of knowledge is more .From these knowledge points through analysis and concluded that some of the material density Now summarized as follows: First, the definition of law 1. This method is based on the definition of density to find the material’s density.As long as you know the mass of a material mm and volume V, you can find the density ρ. Ρ = .V Example 1 has a mass of 8.9 kg of copper, the measured volume was 1 m 3, test