Congruent melting point represents a definite temperature just like the melting points of pure components. In some phase diagrams, the congruent melting point of a compound AB may lie above the melting points of pure components A and B.
A congruent melting point signifies a specific temperature comparable to that of pure substances. In some phase diagrams, the congruent melting point for compound AB could be above the individual melting points of pure components A and B.