Some articles on molecules, molecule:
... The cohesive forces among liquid molecules are responsible for the phenomenon of surface tension ... In the bulk of the liquid, each molecule is pulled equally in every direction by neighboring liquid molecules, resulting in a net force of zero ... The molecules at the surface do not have other molecules on all sides of them and therefore are pulled inwards ...
Famous quotes containing the word boundary:
“The totality of our so-called knowledge or beliefs, from the most casual matters of geography and history to the profoundest laws of atomic physics or even of pure mathematics and logic, is a man-made fabric which impinges on experience only along the edges. Or, to change the figure, total science is like a field of force whose boundary conditions are experience.”
—Willard Van Orman Quine (b. 1908)