[engr.salmananjum]

Hi. i came across this sentence and i don't know  why is that so? how boiling point effects the velocity of gas components.

as the gas moves through the chromatography columns, components of the "gas with lower boiling points move more slowly than the components with higher boiling points."

Please Explain how

Mod Edit-- no need to yell

[Arkcon]

A quick Google search has a number of references, sometimes with explanations.  Briefly, compounds with a lower boiling point move faster on a GC column.  You'd expect this, the column is heated, if its at a temperature below a compound's boiling point, then the compound will only move as its swept by the carrier gas, lower boiling compounds are already gases and will move faster.

So, recheck your reference, try to see what its trying to say.