Polymers are long chain molecules. These long chains become easily tangled
with each other. The paint in the tin consists of tangled molecules and because
of this does not flow easily. When the paint is brushed the act of brushing aligns
many molecules so that their chains point in the same direction. This allows
them to slide more easily over one another and so the viscosity decreases.
1.4 Surfaces
Molecules in the bulk of a liquid are surrounded by other molecules and are
subjected to attractive forces which are roughly the same in all directions. At
the surface of the liquid, however, the molecules have no
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.