1、关于内能的概念由于物质是由分子组成的,分子又是不停地做无规则运动,分子有质量,它们之间有相互作用力,因此每个分子都有动能和势能.由于组成物质的分子是大量的,故我们把物体内部所有分子做无规则运动的动能和分子的势能的总和叫做物体的内能. 1. About the concept of internal energy Because substances are made up of molecules, molecules are constantly doing irregular movements. The molecules have mass and they have interactions. Therefore, each molecule has kinetic energy and potential energy. The molecules of matter are numerous, so the sum of the kinetic energy of all the molecules inside the object and the potential energy of the molecules is called the internal energy of the object.