So fractional distillation is used to separate 2 liquids that have a similar boiling point. Glass beads or any other inert material can be used to increase surface area in the distillation column to maximize condensation. Anyways, you apply heat to the distilling pot to begin vaporizing both liquids. The point is to vaporize the more voltatile liquid more. If I start with a 1:1 vapor ratio, the vapor inside the system will become 3:1 upon the first evaporation/condensation cycle because the more volatile liquid will want to go into gas phase much more. In fact, it goes into the gas phase 3x more readily than the less voltatile liquid. However, I can't figure out why it then becomes 9:1, 27:1, with each evaporation/condensation cycle.