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密度概念的引入在学习密度知识前,我们先回顾两个知识:1.物质和物体有什么区别?物体是一个实物概念,如汽车、桌子、树等,是我们可以通过各种方式看得见、摸得着的东西.物质则是一个宏观概念,我们经常说的物体是由什么东西组成的,指的就是物质.比如汽车主要是铁做的,桌子的主要材料是木,铁、木就是物质.物体是由物质构成的.2.物质的体积、物体的体积、容器的容积有什么不同?我们可以通过一个例子来了解这三者之间的区
Introduction of Density Concepts Before we learn density knowledge, we first review two things: 1. What is the difference between material and object? An object is a physical concept such as a car, a table, a tree, etc. We can see it in various ways , Tangible things.Material is a macro concept, we often say that the object is composed of something, refers to the material.For example, the car is mainly made of iron, the main material of the table is wood, iron, wood is Material. The object is made of matter .2 What is the difference between the volume of the material, the volume of the object, the volume of the container? We can use an example to understand the area between the three