For vapor/liquid equilibrium diagrams, mole fractions are most commonly used.įig. Compositions represented on a ternary diagram can be expressed in volume, mass, or mole fractions. 1d, lie on a straight line connecting the two points on the ternary diagram. Finally, mixtures of any two compositions, such as A and B in Fig. In addition, mixtures lying on any line connecting a corner with the opposite side contain a constant ratio of the components at the ends of the side ( Fig. For mixtures along any line parallel to a side of the diagram, the fraction of the component of the corner opposite to that side is constant ( Fig.
Several other useful properties of triangular diagrams are a consequence of this fact.
Thus, the composition of a point in the interior of the triangle can be calculated as Such diagrams are based on the property of equilateral triangles that the sum of the perpendicular distances from any point to each side of the diagram is a constant equal to the length of any of the sides. Phase behavior of mixtures containing three components is represented conveniently on a triangular diagram such as those shown in Fig.
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