The density is irrelevent, it's all about the displacement volume. :smile:
Yes I know that, in fact that's kind of the point. The density of water in the atmosphere is irrelevant when there is a similar force acting in the same direction as buoyancy gives to a ship. So long as there is a strong enough updraft created by warm air meeting cold air, the water droplets as well as water vapour will remain airborne.
Hence why I told DB to expand his scope.