pinnajännityksen
Pinnajännitys, also known as surface tension, is a property of liquids that causes the surface of the liquid to behave like a stretched elastic membrane. This phenomenon arises from the cohesive forces between liquid molecules. Within the bulk of the liquid, molecules are attracted equally in all directions by neighboring molecules. However, at the surface, molecules are attracted more strongly to the molecules below and beside them than to the molecules in the air above. This imbalance of forces pulls the surface molecules inward and sideways, creating a net inward force that minimizes the surface area.
This inward pull is responsible for several observable effects. For instance, small insects like water striders