在人教版选修3-3《第九章物态变化》的第二节中,教材对表面张力的介绍不多,为了帮助学生理解这个概念,介绍如下:1液体的表面张力产生的原因1.1什么是表面层由液体的性质可知:液体中分子与分子之间的距离比气体分子之间的距离小得多,它的平均距离r_0的数量级约为 In the PEP 3-3, Chapter 9, “Chapter 9, Physical Changes,” the textbook introduces little surface tension. To help students understand this concept, the following is presented: 1. Causes of Surface Tension in Liquids 1.1 What is the surface layer by the nature of the liquid we can see: the distance between molecules and molecules in liquid than the distance between gas molecules is much smaller, its average distance r_0 is about the order of