overall energy and the boiling point i need help with the fractional distillation method of a couple of substances at least more than two substances , just like air actually what am i looking for is that why do substances in air with a low boiling point like nitrogen reach higher the fractionating column even if it looks like that substances with higher boiling point will absorb more energy and thus eventually result in greater kinetic energy (at least to me). please help . heres how i came to know that nitrogen rises higher the fractionating column
The gases in the distillation column boil off according to their boiling point.

   Gas          Boiling point
   Nitrogen     77.355 K ​(−195.795 °C)
   Argon        87.302 K (−185.848 °C)
   Oxygen       90.188 K ​(−182.962 °C)


The distillation column shown is setup for continuous distillation. But imagine that a pot distillation was being done. Nitrogen would boil off first, then argon, then oxygen. So the various trays in the distillation column represent different temperatures. Nitrogen boils off at the top since it has the lowest boiling point, and oxygen collects in the "pot" since it has the highest boiling point.