A video was added to the wiki link in the OP. Look at what happens to the balloons in the video.
The atoms of the atmosphere would behave similarly if the temperature were as low. The movement of gasses does not even exist at that level.
How is air going to move from areas of high to low pressures, and then expelled out into space, if the movement of gasses cease at some point before the edge?
Hello, Thomas. Your statements are partially correct. Atoms that theoretically maintain a temperature of 0 Kelvin would not display motion. Temperature is, after all, simply the average kinetic energy of a (fluidic) system. Unfortunately, the idea of a gas at 0 K around the edges of a flat earth is not possible. There are a couple of reasons for this:
1. The only way to achieve 0 K is having a pure vacuum. Any atom is incapable of staying at 0 K, due to quantum mechanics. Not even outer space is at 0 K.
2. Even if the above reason was ignored, you cannot maintain a gas at 0 K if it is next to a gas that has a non-zero temperature. Collisions between the atoms will transfer kinetic energy and hence raise the temperature of the gas at the edge. Hence, any temperature gradient in the atmosphere will ruin a condition of zero-T gas at the edge, on timescales commensurate with the DeBroglie wavelength, about a microsecond for atoms in the air.
In short, the movement of gases is unavoidable. The only way to make a system 0 K is to remove all the gas!