中等师范学校物理课本第53页用图2-14和2-15的方法演示浸润液体和不浸润液体在毛细管里升高和下降的现象。笔者根据个人教学实践感到上述方法存在一些弊端。 1.可见度差,毛细现象只有当管径小到一定程度才明显,尽管采用有颜色的液体,也只能有少数同学能清楚看到,绝大多数学生看不见。 The Physics Department of Normal School of Secondary Education Page 53 Use the methods shown in Figures 2-14 and 2-15 to demonstrate the phenomena of rising and falling in the capillaries of infiltrating and non-infiltrating liquids. According to personal teaching practice, the author feels that there are some drawbacks to the above method. 1. Visibility is poor. The capillary phenomenon is obvious only when the diameter of the tube is small to some extent. Despite the use of colored liquid, only a few students can clearly see that the vast majority of students cannot see it.