Interface
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An interface is the region that separates two bulk phases. It is therefore
sometimes misspelled as "interphase." It is a molecular
structure (one of its characteristic lengths is of molecular size). The cost
in free energy to create such a structure is the surface tension.
The simplest, most studied, and perhaps most important interfaces is a fluid/fluid interface: the liquid/vapour interface of a one-component system.
Interfaces are subject to thermal noise that cause thermal capillary waves.