The image shows the molecule under the surface of the liquid is raengkratham. in all directions. While the molecules at the surface are raengkratham from the bottom only, which makes the surface tension into the Center.
Figure molecules beneath the surface of the liquid. It has strong interactions in every direction. While the molecular surface A force from below. This causes the surface tension toward the center.
Figure shows molecules under the surface of the liquid. A force between molecules in all directions, while the surface is unloaded from the bottom only. The surface tension into the center.