The Refusal of Water!

You must have spilled water on a table or a similar flat surface! You would have noticed that when the water reaches the end of the table, it doesn't spill over but begins to flow along the table boundary. The only water that runs down is that which spills over immediately after pouring; it then breaks off. If the edge of the table is rounded, then the water which is running over the rounded edge pulls the entire puddle of water with it. Why is that?

Flowing water follows the force of gravity. On a sharp table-edge, the cohesion of the water, the attractive power between the rounded molecules, is interrupted. Over a rounded edge, the cohesion remains, and it is even stronger than the adhesion, the attractive force between the molecules of the water and the plastic. Therefore, all the water pours off, and the tabletop is soon dry.