Please read all this summary post before answering []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.)

1) We can account for pressure since p is_proportional_to depth and the atmospheric "scale heights" (real term, look it up) are

Earth 8.9km Venus 15 to 20km expected pressure ratio say about 3, worst case

2) Surface gravity on venus is 0.904g (accounts for rotation as on earth variation in g from pole to equator is only 0.3%), so about the same; expected pressure ratio = 1.

3) Surface Temperature is 735 K - which could give us a pressure factor of 735/232 = about 3.

4) Density due to composition I estimate by considering a pure N2 earth atmosphere and a pure CO2 venusian atmosphere. Well it's just a rough estimate (N2 is lighter than O2 anyway).

Density of Nitrogen STP 1.251 g/ml

Density of Carbon Dioxide STP 1.562 g/mL

This accounts for a factor of about 1.25

TOTAL of all factors so far identified = 3 * 1 * 3 * 1.25 = 10.5

OK, so what are we missing,

*at least* a factor of 92/10.5 or aprox 9 in both atmospheric mass and pressure.

What did I miss or do wrong???

Please read all this summary post before answering []