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In outer space, water forms a sphere, and an air bubble doesn't "rise"

Detailed Description

How Does Water Behave in Outer Space?

This unique picture shows not only a water drop but also an air bubble inside of the water drop. Notice they both behave the same....according to the laws of physics in space. They both form spheres. This makes sense, as without gravity to tug downward, the forces governing the objects are all the same. So, the water drop (and air bubble) form themselves so they occupy a shape having the least amount of surface area, which is a sphere. On Earth, gravity distorts the shape, but not in space.


Credit: NASA, Public domain