Answer to Question #47309 in Physics for mike mrm

How big could a bubble of air and water be in zero gravity? Assume air surrounds and fills a bubble of water.
I am designing an all water planetoid for a new science fiction novel I am writing. The Planetoid is a spherical bubble of water filled with air, and covered by a sufficiently thick atmosphere to prevent evaporation into space. What could the dimensions of this bubble be? Assume that artificial gravity can be used to generate a force of one gravity at the outer surface. The bubble is also about 300 meters thickness maximum. The shell thickness is 300 meters, the diameter is the unknown. The gravity generators are at a depth of 150 meters.