In the physical sciences, an interface is the boundary between two spatial regions occupied by different matter, or by matter in different physical states.
Wikipedia
Boundary between different phases of matter
Wikidata
A thin layer or boundary between different substances or two phases of a single substance.
Wiktionary
Chemistry, physics: thin layer or boundary between different substances, or phases of a single substance.
Wiktionary (translation)
EN
If water and oil are mixed together, they tend to separate, and at equilibrium they are in different strata with an oil-water interface in between.
Wiktionary
The surface of a lake is a water-air interface.
Wiktionary
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