8.3 The behavior of liquid water is the result of the stickness of water molecules Cohesive force(内聚力) forces of attraction between molecules of a single substance Adhesive force(粘合力): forces of attraction between molecules of two different substances 。。° Coin resting on the water surface. Why? Sur/ ace tension(表面张力) Surface tension(表面张力)The tendency of the molecules on the surface of a liquid to go into the 99 liquid. The surface tension also Figure 8. 14 accounts for the spherical shape of A molecule at the surface is pulled only sideways and liquid d downward by neighboring molecules. A molecule beneath pecially in the the surface is pulled equally in all directions weightless environment8.3 The behavior of liquid water is the result of the stickness of water molecules Cohesive force ( 内聚力): forces of attraction between molecules of a single substance. Adhesive force ( 粘合力): forces of attraction between molecules of two different substances. Coin resting on the water surface, Why? Surface tension (表面张力) Surface tension ( 表 面 张 力 ): The tendency of the molecules on the surface of a liquid to go into the liquid. The surface tension also accounts for the spherical shape of liquid drops, especially in the weightless environment