高中物理甲种本第二册第四章“液体的表面现象”一节,课本中介绍了用棉线圈演示液体表面的收缩趋势。方法是把一棉线圈拴在铁丝环上,使环上布满肥皂水薄膜(课本图4—10甲),然后用热针刺破棉线圈里那部分薄膜,外边的薄膜就将棉线圈张紧为圆形。用这方 High school physics A species of the second chapter of the second chapter “liquid surface phenomenon ” section, the textbook describes the use of cotton coils to demonstrate the liquid surface shrinkage trend. The method is to put a cotton coil on the wire ring, so that the ring is covered with soapy water film (textbook Figure 4-10 A), and then use hot needles to pierce the part of the film in the cotton coil, the outer film will cotton coil Close to round. Use this side