初二物理新教材已经学过了“热现象”一章。本章内容是在原有知识的基础上,进一步学习分子运动论的初步知识、内能的概念、热量的计算,以及能量守恒定律。学习本单元,可以使我们理解许多热现象的性质。 一、重点、难点知识的概析 1.正确理解分子间的相互作用力 The second physics textbook has already learned the chapter “Hot Phenomena”. The content of this chapter is based on the original knowledge, further study the preliminary knowledge of molecular movement theory, the concept of internal energy, the calculation of heat, and the law of conservation of energy. Learning this module allows us to understand the nature of many thermal phenomena. I. Analysis of Key and Difficult Knowledge 1. Correct understanding of intermolecular interaction