Surface Tension and Capillary Tubes Worksheet Answer Key The process through which water is pulled up a thin, glass tube against gravity is called capillary action. Water rises in the tube due to the attractive forces between the liquid and container’s solid walls. This is the same reason that water forms the that is commonly observed in “meniscus” chemistry labs. As seen in the diagram below, the liquid seems to climb up the sides of the thin capillary tube. Now, let’s derive an expression for the surface tension of the water in this scenario. The of density inside the capillary is at equilibrium, which means all the forces on the ρ column of water balance out in the vertical direction. Determine an expression for the weight of water found in the cylinder of height h and radius r, as seen above. Express your answer in terms of the given variables and fundamental constants. The force between the water and the glass wall of the capillary tube does not act in a purely vertical direction. In the diagram above, note that the water meets the glass sides at angle θ from the vertical. The force of attraction on the water, FST, is instead directed tangent to the surface at this same angle Draw a free body diagram of the two forces acting on the column θ. of water, the force from surface tension FST and the weight of the water Fg
Surface Tension and Capillary Tubes Worksheet Answer Key The process through which water is pulled up a thin, glass tube against gravity is called capillary action. Water rises in the tube due to the attractive forces between the liquid and container’s solid walls. This is the same reason that water forms the “meniscus” that is commonly observed in chemistry labs. As seen in the diagram below, the liquid seems to climb up the sides of the thin capillary tube. Now, let’s derive an expression for the surface tension of the water in this scenario. The of density ρ inside the capillary is at equilibrium, which means all the forces on the column of water balance out in the vertical direction. Determine an expression for the weight of water found in the cylinder of height h and radius r, as seen above. Express your answer in terms of the given variables and fundamental constants. The force between the water and the glass wall of the capillary tube does not act in a purely vertical direction. In the diagram above, note that the water meets the glass sides at angle θ from the vertical. The force of attraction on the water, FST, is instead directed tangent to the surface at this same angle θ. Draw a free body diagram of the two forces acting on the column of water, the force from surface tension FST and the weight of the water Fg