Binary Boiling Point Diagram (graph) of a hypothetical mixture of two components <b>without</b> an azeotrope.  An example isotherm line is shown to compare vapor and liquid compositions at that temperature.
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>: vectorization, translation
<a href="//commons.wikimedia.org/wiki/File:Binary_Boiling_Point_Diagram.PNG" title="File:Binary Boiling Point Diagram.PNG">Binary_Boiling_Point_Diagram.PNG</a> by <a href="//commons.wikimedia.org/wiki/User:H_Padleckas" title="User:H Padleckas">H Padleckas</a>