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The key points from this module are as follows:

- Surface energy is greater than the internal energy for solids.
- Surface energy in solids is increased by increasing the surface area, while in liquids, surface energy reduces with a reduction in the surface area.
- Adsorption of foreign molecules on the surface of solids causes a reduction in surface energy.
- Surface energy is called surface tension in liquids.
- Surface molecules of the liquids get farther apart with the loss of molecules, causing an increased net attraction between the molecules, hence high surface energy.
- Surface energy is directly proportional to the adhesion strength.