This was brought up much, much earlier in the thread. By your reasoning, the atmosphere should consist of layers of gases, with the heaviest gasses on the surface. Clearly, this is not the case.
The masses of molecules like O2 and CO2 are so negligibly small that the ideal gas law doesn't even take them into account.
you're right. i think it might even have been me that brought this up before.
when thedifferent gases are dissolved together, they float somewhat the same in the atmosphere.
when we put out gases in excess, which is what is claimed(now) to be the cause of the (so called) warming, they aren't dissolved.
as in the co2 that is suddenly a pollutant. they say the co2 rises up into the upper atmosphere and "insulates" the planet, preventing the heat within the atmosphere from radiationg out into space.
that's where i was headed......co2 as put out by us, will simply settle in low, plankton, and plants will breath well(they like co2), and in return, give us more 02.