Really? I suspect this is a troll but, in the static case, roughly the ratio of volume of space to how much gravitational force said volume applies on other objects. Extrapolate correctly for qm/gr - thats an exercise left for the reader.

Depending on your scales etc you may wish to group different things into the category of “object”, eg a car would likely be be selected as a valid grouping of atoms as an object by most people in conversation wheres it is mostly empty space at the micro level, and has a bunch of very different densities (many oom) at diff volumes even at the macro scale (eg the air in the trunk vs the engine block).