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- The spontaneous movement of liquids up or
- down narrow tubes, or capillaries. The
- movement is due to unbalanced molecular
- attraction at the boundary between the liquid
- and the tube. If liquid molecules near the
- boundary are more strongly attracted to
- molecules in the material of the tube than to
- other nearby liquid molecules, the liquid
- will rise in the tube. If liquid molecules
- are less attracted to the material of the
- tube than to other liquid molecules, the
- liquid will fall.
-