#interface  (physical chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases)
  supertype:  #surface.bounds  the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface"
  subtype:  #oil-water_interface__oilwaterinterface  an interface forming the boundary between the non-miscible liquids oil and water

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