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Carbon dioxide (95% on Venus) isn't that much denser than nitrogen (70% Earth) (see figures above)The relative density of these gasses at STP cannot account for a 93xmass difference in the atmosphere (or a 92xpressure difference)
Please read the original post before answering, or now read this more detailed summary. (Various factors have been accounted for, e.g. I know PV/T is constant for an ideal gas.)
OK, some data;Density of Nitrogen STP 1.251 g/mlDensity of Carbon Dioxide STP 1.562 g/mLAfter density, temperature and height, there is still a factor of 10 to be accounted for.
There seems to be rather a circular argument going on here, I take it the mass of the atmosphere has been calculated by measuring the surface pressure and working back.I recall there was a Russian lander back in the sixties that survived long enough to send back both pressure readings and a ground picture