Zeotropic Mixture
A mixture of chemicals is said to be zeotropic if the composition of the vapor and the liquid phase at the vapor-liquid equilibrium state are never the same. Dew point and bubble point curve do not touch each other over the entire composition range with the exception of the pure components (curve end points). Mixtures where the both curves are touching each other in at least a single point - indicating the same composition in the vapor and liquid phase - are azeotropic mixtures.
Vapor pressures and boiling temperatures of a zeotropic mixture are always between the pure component boiling points resp. vapor pressures. Azeotropic mixtures show a pressure maximum/temperature minimum or pressure minimum/temperature maximum that are above/below the values of the pure components.
Stating compositions of zeotropic mixtures is common for some commercially available blends but the term zeotropic is valid only for a given temperature and pressure but not for specific compositions.
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