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Have you ever noticed that dewdrops on spiderwebs and falling drops of oil are nearly spherical What happens when rain falls on a freshly washed and waxed car The water drops bead up into rounded shapes, as shown in the spiderweb in Figure 13-7 All of these phenomena are examples of surface tension, which is the tendency of the surface of a liquid to contract to the smallest possible area Surface tension is a result of the cohesive forces among the particles of a liquid Notice that beneath the surface of the liquid shown in Figure 13-8a on the next page, each particle of the liquid is attracted equally in all directions by neighboring particles, and even to the particles of the wall of the container As a result, no net force acts on any of the particles beneath the surface At the surface, however, the particles are attracted downward and to the sides, but not upward There is a net downward force, which acts on the top layers and causes the surface layer to be slightly compressed The surface layer acts like a tightly stretched rubber sheet or a film that is strong enough to support the weight of very light objects, such as the water strider in Figure 13-8b on the next page The surface tension of water also can support a steel paper clip, even though the density of steel is nine times greater than that of water Try it! Why does surface tension produce spherical drops The force pulling the surface particles into a liquid causes the surface to become as small as possible, and the shape that has the least surface for a given volume is a sphere The higher the surface tension of the liquid, the more resistant the liquid is to having its surface broken For example, liquid mercury has much stronger cohesive forces than water does Thus, liquid mercury forms spherical drops, even when it is placed on a smooth surface On the other hand, liquids such as alcohol and ether have weaker cohesive forces A drop of either of these liquids flattens out on a smooth surface Viscosity In nonideal fluids, the cohesive forces and collisions between fluid molecules cause internal friction that slows the fluid flow and dissipates mechanical energy The measure of this internal friction is called the viscosity of the liquid Water is not very viscous, but motor oil is very viscous As a result of its viscosity, motor oil flows slowly over the parts of an engine to coat the metal and reduce rubbing Lava, molten rock that flows from a volcano or vent in Earth s surface, is one of the most viscous fluids There are several types of lava, and the viscosity of each type varies with composition and temperature.

Figure 13-8 Molecules in the interior of a liquid are attracted in all directions (a) A water strider can walk on water because molecules at the surface have a net inward attraction that results in surface tension (b)

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