azeotrope

[uh-zee-uh-trohp, ey-zee-]
noun Physical Chemistry.
any liquid mixture having constant minimum and maximum boiling points and distilling off without decomposition and in a fixed ratio, as isopropyl alcohol and water.

Origin:
1910–15; a-6 + Greek (ein) to boil + -o- + -trope

azeotropic [ey-zee-uh-trop-ik, -troh-pik] , adjective
azeotropy [ey-zee-o-truh-pee] , azeotropism, noun
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World English Dictionary
azeotrope (əˈziːəˌtrəʊp)
 
n
a mixture of liquids that boils at a constant temperature, at a given pressure, without change of composition
 
[C20: from a-1 + zeo-, from Greek zein to boil + -trope]
 
azeotropic
 
adj

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American Heritage
Medical Dictionary

azeotrope a·ze·o·trope (ə-zē'ə-trōp', ā'zē-)
n.
A liquid mixture of two or more substances that retains the same composition in the vapor state as in the liquid state when distilled or partially evaporated under a certain pressure.


a'ze·o·trop'ic (a'zē-ə-trŏp'ĭk, -trō'pĭk) adj.
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Encyclopedia Britannica
Encyclopedia

azeotrope

in chemistry, a mixture of liquids that has a constant boiling point because the vapour has the same composition as the liquid mixture. The boiling point of an azeotropic mixture may be higher or lower than that of any of its components. The components of the solution cannot be separated by simple distillation.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The coal was dried by distilling off some of the chlorobenzene-water azeotrope.
In addition to azeotrope formation, the single theoretical plate distillation
  technique suffers from inadequate separation.
It is an azeotrope, so it will not fractionate during operation.
The boiling points of the pure components must be sufficiently close to permit
  the formation of an azeotrope.
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