![]() Ternary phase diagrams can also be drawn using mole fractions instead of mass fractions. ![]() The fraction of the distance from the base to the corner is the mass fraction of that component. This works well for volume fractions, which must sum to one. Not a projection, like a 3D scatter plot, because there are only two degrees of freedom the parameters of a ternary diagram cannot be independent. In the "alternate view", the mass fraction of a component is determined by drawing a line through the point and perpendicular to the base opposite that component. The three-dimensional equivalent of the spectrum is the ternary diagram: 3-parameter space mapped onto 2D. These axes are labeled by drawing a line through the point this line is parallel to the base of the triangle that is opposite the corner corresponding to that pure component. The mass fraction of a component in the mixture is read off the axis that is the same color as that component in the standard view. Each corner of the triangle corresponds to a pure component. Move the black dot to any location within the triangle by clicking on that location, which represents the overall composition of the mixture. This Demonstration shows two representations of a ternary phase diagram, which is used to represent the phase behavior of three-component mixtures.
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