It is a well known fact that there are two distinct behaviours of dimorphism in which transitions are of reversible and irreversible natures. O. Lehmann was the first in classifying it by the two categories, enantiotropy and monotropy. Later it was interpreted by Ostwald and others on the basis of the phase theory. However, clear definitions have not been made so far, which are consistent with all the experimental cases in the wide range of pT-diagram. To make it more complete and concrete, some definitions are given for the terms enantiotropy and monotropy. These terms not only serve to express the absolute stability but also to express the mutual stability of the two modifications in one component. The thermodynamic relations connected to them are also described. The cases of pseudequilibrium are also spoken of. As the result of these considerations, various theories on enantiotropy and monotropy are brought into one conformity.
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