Where two homogeneous bulk phases meet there is a region of finite thickness where the
properties change, often markedly, as we move from one bulk phase to the other. Such
regions are known as surfaces or interfaces. Although we may commonly think of a surface
as being of negligible thickness, in fact, when we are discussing phenomena at a molecular
level the thickness of the interfacial region is significant and definitely non-zero.
Because there are three types of bulk phase, it is possible to classify interfaces based on the
nature of the bulk phases that lie on either side of the interface. Thus, there are five types of
interface:
Quiz1
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