1. n. [Enhanced Oil Recovery]
A graphical representation of concentrations in a system with three components. Since the sum of the component percentages is unity, any composition can be uniquely mapped to a single point within a triangular space. In many cases, a mixture of fluids with more than three components is divided into three pseudocomponents, such as light, intermediate and heavy components of a hydrocarbon phase. These diagrams are used to illustrate the phase behavior of a fluid.