Do individual molecules in a gas like the Earth’s atmosphere travel in parabolas?
I know that there are many collisions in such a gas, but in between collisions, I would guess that gravity should effect the motion of the particles. However, I’m having a tough time visualizing how this would result in air currents. Is it just that the velocity of the particles in a gas dwarfs the gravitational acceleration so they might as well be traveling in straight lines? Or are air currents composed of particles that are all traveling on tiny significantly parabolic arcs?