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Azeotrope
An azeotrope is a mixture of two or more components which has a constant boiling point at a particular composition. A consequence of this constant boiling point is that one cannot entirely separate the components by distillation (though of course, in the case of the ethanol-water azeotrope, you can get close enough for all practical purposes).
An azeotrope is said to be positive if the constant boiling point is at a temperature maximum, and negative when the boiling point is at a temperature minimum.
Examples of azeotropes :
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