Explain why surface tension of liquid is only at the surface of the liquid and not inside the liqu (2 ma __

Surface tension arises from the cohesive forces between liquid molecules. A molecule *inside* the liquid experiences attractive forces from all directions, effectively canceling each other out. However, a molecule *at the surface* experiences a net inward force because there are no upward-pulling liquid molecules above it. This inward pull minimizes the surface area and creates the phenomenon we call surface tension. Since this imbalance of forces only exists at the surface, surface tension is a surface phenomenon.