azeotropic mixture

<chemistry> This is a mixture of liquids in which the composition of the vapor is the same as that of the liquid phase, so it can be distilled without any change in composition. ... (12 Mar 1998) ...
Found on http://www.encyclo.co.uk/local/20973

azeotropic mixture

Also known as a constant-boiling-point mixture, a solution of two or more liquids which on distillation behaves as a pure liquid: its boiling point is invariable at a given pressure, and the composition of the vapor phase is the same as that of the liquid. See also phase equilibria.
Found on http://www.daviddarling.info/encyclopedia/A/azeotropic_mixture.html
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