ABSTRACT

Interfaces are the boundaries between immiscible phases. They may be formed between solid (S) and liquid (L), solid (S) and gas (G), liquid (L) and gas (G), and between a polar liquid (L) and an apolar liquid (L). In the case of a boundary with a gas (G) or with vacuum (–), the interface is usually called “surface.” To indicate the physical exterior of a body, irrespective of its surroundings, the notion “surface” may be used as well.