Surface tension
Interfacial tension

 A surfactant is briefly defined as a material that can greatly reduce the surface tension of water when used in very low concentrations.
The surface of a material has the internal and external particles in a space. The interface will has two different phases. For example, the shape of a drop of water is spherical due to the interface of air and water separates the two substances and internal force of water pulls the surface particles of water. This phenomenon also happens to the immiscible liquids. It is called interfacial tension.

One substance that can help two materials like water and oils mix together also reduces the interfacial tensions. It is surfactant. The applications will be in cosmetics, detergents, and so on.    

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