Under what conditions, then, would microscopic particles tend to sink in water? There are two opposing tendencies at work here, the tendency to sink based on Archimedes' laws of buoyancy, and the tendency to diffuse throughout the water. We normally observe the latter to dominate, but which would dominate under very high gravity? Under high gravity, the motions of the water molecules will remain random, and we think they would not change significantly; but the sinking effect should increase. At the very least there should be a greater concentration of the particles at the bottom of the container than at the top. Thus, the general problem that we would like to investigate is whether molecule-sized particles in water tend to sink under high gravity.