Surface free energy (mJ/m²) is expressed as the energy required to expand a surface per unit area.
In the field of interface science, there are very familiar interfacial phenomena in our daily lives, such as "wetting," "adhesion," "surface tension," "dispersion," and "emulsion."
Surface free energy is a term used when the surface tension is composed of several forces.
The surface tension of solids is often referred to as surface free energy, in contrast to the surface tension of liquids.
While surface tension (mN/m) is the force required to pull a line of unit length, surface free energy (mJ/m²) is expressed as the energy required to expand a unit area, and although the units are different, the values are equivalent.
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