If CO2 is heavier than air why does it rise?

Short answer is CO2 is heavier thanambient air, but it does not drift to the ground as there is a lot of mixing going on in ambient air. ... read more

"Like carbon dioxide, nitrogen dioxide is heavier than air so the highest concentration of gas is typically located at the silage surface, which is the area where a person will be going if they need to enter the silo for any reason." Out in the open atmosphere, there is enough motion in the air to keep the oxygen and carbon dioxide mixed up. read more

It does not rise! It sinks because it is heavier than air! BUT, when cold CO2 comes in contact with air, it cause cloud condensation, and the resulting water vapor rich air rises because water vapor is lighter than air. read more

Gases lighter than air rise, those heavier than air sink. No surprises there. When petrol fumes are released, they too sink quickly, at least to start with. A typical molecule in petrol is one of the isomeric octanes, general formula C8H18, with a relative vapour density of 57 - some 4 times greater than air. read more