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- The molecules of a liquid tend to stick
- together. This attractive force between the
- molecules causes surface tension. The
- molecules on the surface are pulled toward
- the body of the liquid, resulting in a
- shrinking of the surface. The surface
- now appears to be a sort of skin, allowing,
- for example, a glass to be filled to a height
- slightly greater than the actual height of
- the glass.
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