Konode

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A conode ( Latin : con = together, Greek οδός = path) is the name given to the line in the phase diagram of a mixture that connects points of state that are in phase equilibrium .

In a binary system , it is parallel to the axis on which the composition of the mixture is plotted. The point through which the conode runs is given by the composition of the mixture and by temperature or pressure .

The solid, liquid or gaseous portions of a component in the given state can be inferred from the respective intersections with the phase boundary lines :

• with a solid-liquid equilibrium:
  • The intersection of the conode and solidus line indicates the composition of the precipitated solid.
  • The intersection of the Konode and Liquidus line indicates the composition of the remaining melt.
• at a liquid-gas equilibrium;
  • The intersection of the Konode and Boiling curve indicates the composition of the condensing liquid.
  • The intersection of the conode and the condensation curve indicates the composition of the residual gas.

The proportions of the two phases of a mixture that is in the two-phase region can be determined analogously to the lever law ( conod rule ).