Editing Phase diagram (section)

===Ternary phase diagrams===
A system with three components is called a ternary system. At constant pressure the maximum number of independent variables is three – the temperature and two concentration values. For a representation of ternary equilibria a three-dimensional phase diagram is required. Often such a diagram is drawn with the composition as a horizontal plane and the temperature on an axis perpendicular to this plane. To represent composition in a ternary system an equilateral triangle is used, called Gibbs triangle (see also [[Ternary plot]]). 
<gallery mode="packed" class="skin-invert-image" heights="200">
File:Gibbs triangle-ternary plot.jpg|Gibbs triangle
File:Space diagram of a three-component system.jpg|alt=Space diagram of a three-component system|Space phase diagram of a ternary system
</gallery>
The temperature scale is plotted on the axis perpendicular to the composition triangle. Thus, the space model of a ternary phase diagram is a right-triangular prism. The prism sides represent corresponding binary systems A-B, B-C, A-C.

However, the most common methods to present phase equilibria in a ternary system are the following:
1) projections on the concentration triangle ABC of the liquidus, solidus, solvus surfaces;
2) isothermal sections;
3) vertical sections.<ref>Alan Prince, "Alloy Phase Equilibria", Elsevier, 290 pp (1966) ISBN 978-0444404626</ref>