Question

Explain surface tension and surface energy.

Answer 1

SURFACE TENSION Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible. Surface tension allows insects (e.g. water striders), usually denser than water, to float and slide on a water surface.

SURFACE ENERGY Surface energy, or interfacial free energy, quantifies the disruption of intermolecular bonds that occurs when a surface is created. In the physics of solids, surfaces must be intrinsically less energetically favorable than the bulk of a material (the molecules on the surface have more energy compared with the molecules in the bulk of the material), otherwise there would be a driving force for surfaces to be created, removing the bulk of the material (see sublimation). The surface energy may therefore be defined as the excess energy at the surface of a material compared to the bulk, or it is the work required to build an area of a particular surface. Another way to view the surface energy is to relate it to the work required to cut a bulk sample, creating two surfaces.

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Answer 2

Explanation:

Surface tension has the dimension of force per unit length, or of energy per unit area. The two are equivalent, but when referring to energy per unit of area, it is common to use the term surface energy, which is a more general term in the sense that it applies also to solids.SURFACE TENSION Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible. ... SURFACE ENERGY Surface energy, or interfacial free energy, quantifies the disruption of intermolecular bonds that occurs when a surface is created.

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