Fractional Distillation: Used to separate Cloze (1): JXUwMDM1JXUwMDA0JXUwMDFhJXUwMDEwJXUwMDBhJXUwMDBiJXUwMDBlJXUwMDA5 liquids with different but very close Cloze (2): JXUwMDNhJXUwMDBkJXUwMDA2JXUwMDA1JXUwMDA1JXUwMDA3JXUwMDA5JXUwMDQ3JXUwMDUwJXUw MDFmJXUwMDA2JXUwMDA3JXUwMDFh . This method is more efficient than simple distillation.

A Cloze (3): JXUwMDNlJXUwMDE0JXUwMDEzJXUwMDAyJXUwMDE3JXUwMDFkJXUwMDA2JXUwMDAxJXUwMDBmJXUw MDE1JXUwMDFkJXUwMDA3JXUwMDA5 column is introduced between the distillation flask and the Cloze (4): JXUwMDNiJXUwMDBjJXUwMDAxJXUwMDBhJXUwMDAxJXUwMDBiJXUwMDFkJXUwMDE2JXUwMDE3 . The upper portion of the column, which is closer to the condenser, is cooler than the lower portion and hence, only gases with the same temperature as the upper portion are allowed to pass on to the condenser. On the other hand, the gases with higher boiling points will Cloze (5): JXUwMDNiJXUwMDBjJXUwMDAxJXUwMDBhJXUwMDAxJXUwMDBiJXUwMDFkJXUwMDE2 and flow back to the bottom into the distillation flask, and is heated into a gas again. At the end, liquid with the Cloze (6): JXUwMDM0JXUwMDAzJXUwMDE4JXUwMDEyJXUwMDE2JXUwMDA3 boiling point will be the first to boil and hence the first to be distilled out and collect