Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A liquid mixture of two or more substances that boils at a constant characteristic temperature lower or higher than any of its components and that retains the same composition in the vapor state as in the liquid state.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physical chemistry, physics A mixture of two or more substances whose liquid and gaseous forms have the same composition (at a certain pressure); the substances cannot be separated by normal distillation.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[a– + Greek zein, to boil; see zeolite + Greek -tropos, turning; see –tropous.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek α- (a-, "no") + ζέειν (zeein, "to boil") + τρόπος (tropos, "state").

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Examples

  • Ethanol and water at the 96/4 proportions form an azeotrope, which is a mixture of stuff that boils in the same proportions as it is in liquid form.

    Archive 2007-10-01 James Killus 2007

  • Ethanol and water at the 96/4 proportions form an azeotrope, which is a mixture of stuff that boils in the same proportions as it is in liquid form.

    Alcohol James Killus 2007

  • Things like methylene chloride being rather more weirdly polar as a solvent than you'd expect, or the fact that some amines will stick to solid magnesium sulfate drying agent (but not sodium sulfate), or how you can azeotrope out acetic acid with toluene, or how you want palladium tetrakis to be lemon yellow and not orange

    In the Pipeline 2010

  • Water and ethanol form an azeotrope - a mixture whose composition can't be changed by distillation - at a ratio of 95.6: 4.4 ethanol: water.

    Bayblab 2009

  • For chemical as well as regulatory reasons, it is unlikely that 100\% ethanol is used; given the formation of an azeotrope at approximately 95 percent, it's hard even to get 100\% ethanol.

    Citizendium, the Citizens' Compendium - Recent changes [en] 2008

  • For chemical as well as regulatory reasons, it is unlikely that 100\% ethanol is used; given the formation of an azeotrope at approximately 95 percent, it's hard even to get 100\% ethanol.

    Citizendium, the Citizens' Compendium - Recent changes [en] 2008

  • For chemical as well as regulatory reasons, it is unlikely that 100\% ethanol is used; given the formation of an azeotrope at approximately 95 percent, it's hard even to get 100\% ethanol.

    Citizendium, the Citizens' Compendium - Recent changes [en] 2008

  • For chemical as well as regulatory reasons, it is unlikely that 100\% ethanol is used; given the formation of an azeotrope at approximately 95 percent, it's hard even to get 100\% ethanol.

    Citizendium, the Citizens' Compendium - Recent changes [en] 2008

  • For chemical as well as regulatory reasons, it is unlikely that 100\% ethanol is used; given the formation of an azeotrope at approximately 95 percent, it's hard even to get 100\% ethanol.

    Citizendium, the Citizens' Compendium - Recent changes [en] 2008

  • For chemical as well as regulatory reasons, it is unlikely that 100\% ethanol is used; given the formation of an azeotrope at approximately 95 percent, it's hard even to get 100\% ethanol.

    Citizendium, the Citizens' Compendium - Recent changes [en] 2008

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