8. 3 The behavior of lic iquid 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 °。。。° 9 Coin resting on the water surface, Why? Surface tension(表面张力 Surface tension(表面张力)The 9a9 tendency of the molecules on the surface of a liquid to go into the quid. The surface tension also Figure 8. 14 accounts for the spherical shape of A molecule at the surface is pulled only sideways and liquid drops, especiall the downward by neighboring molecules. A molecule beneath 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