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.

noun. 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.

"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."

eutectic  extractive distillation  salt-effect distillation  

azeotropic  

cake  cloy  thoi