Timeline for Why does carbon dioxide not sink in air if other dense gases do?
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| Feb 1, 2021 at 13:26 | comment | added | MSalters | Also, the 4 meters height makes no sense. The Dutch are tall, but not that tall. There are plenty of areas in the Netherlands that are several meters below sea level, but they're not filled with CO2. And trees typically absorb their CO2 via leaves at heights well over 4 meters. | |
| Feb 1, 2021 at 13:23 | comment | added | MSalters | It helps to realize that the forces of two molecules bouncing off each other are much larger than the gravity force on either. That's because the molecule-molecule distance in a collision is nanometer-scale. Earth's gravity is caused by atoms on average 6000 kilometers away. That's a 12 orders of magnitude difference. | |
| Feb 1, 2021 at 6:25 | comment | added | nanoman | "If one gas is one hundred times as dense as the other, there will very little mixture" -- incorrect. Radon is about 100 times heaver than hydrogen. In equilibrium in a 3 m tall room, hydrogen and radon mix uniformly with only ~0.3% difference in composition between floor and ceiling. In equilibrium, neither gas "knows" the other is present! Each simply develops a density profile based on its own scale height. | |
| Feb 1, 2021 at 5:26 | history | answered | Acccumulation | CC BY-SA 4.0 |