![plot ternary diagram plot ternary diagram](https://d2mvzyuse3lwjc.cloudfront.net/doc/en/UserGuide/images/3D_Ternary_Color_Map_Surface/3D_Ternary_Colormap_Surface.png)
These tie lines angle towards the medium-component corner. Within the two-phase region, the tie lines are straight lines that connect the compositions of the vapor and liquid phase in equilibrium (bubble point to the dew point). This is the point at which the liquid and vapor composition are identical (resembles the critical point that we studied before). The binodal curve is formed of the bubble point curve and the dew point curve, both of which meet at the plait point. Figure \(\PageIndex\): Ternary Phase Diagram For A Ternary System. In modern times, we use an equilateral triangle for such a representation. Gibbs first proposed the use of a triangular coordinate system. A consistent and dependable method for reading a ternary diagram includes four steps: Locate the 1 (or 100) point on the axis. A rectangular coordinate plot, having only two axes, will no longer suffice. In Grapher, ternary axes are arranged with the X axis at the bottom of the plot, Y axis to the right of the plot, and Z axis to the left of the plot. Intuitively, having more than two components poses a problem when a pictorial representation is desired. For example, in CO 2 injection into an oil reservoir, CO 2, C 1, and C 2 are often lumped into a single light pseudo-component, while C 3 to C 6 form the intermediate pseudo-component, and the others (C 8+) are lumped together into a single heavy pseudo-component. In this case, each group is treated as a single component. We can also have pseudo 3-component systems, which consist of multicomponent systems (more than 3 components) that can be described by lumping all components into 3 groups, or pseudo-components. For example, air is often approximated as being composed of nitrogen, oxygen, and argon, while dry natural gas can be rather crudely approximated as being composed of methane, nitrogen and carbon dioxide. Ternary systems are more frequently encountered in practice than binary systems. The next more complex type of multi-component system is a ternary, or three-component, system.