# Does Archimedes law depend of lack of matter?

I would like to know if Archimedes law take in equation the lack of matter. Fluid density at 1. An object with density of 0 (or near 0) is put in liquid, it's fixed. The external sphere where liquid is inside is fixed too. The lack of matter change the attraction in all the sphere itself, no ? Density change with depth, no ? How forces can be calculate ?

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I don't understand the question. What is $a$? And why are there lines coming from the black point? What makes the black point special? Is this a vertical cross-section of the geometry? And what do you mean "change the attraction in all the sphere"? There is no attraction in Archimedes principle. –  DumpsterDoofus Oct 24 '13 at 22:20
I changed my image –  Ludovic Oct 25 '13 at 5:19
@Ludovic have a look at bosons, fermions, bose-einstien condensates, superfluids. And then Superfluid Vacuum Theory –  Waqar Ahmad Oct 25 '13 at 6:14
It's quite unclear HOW the floating object is kept fixed. The water on top of it is pulled down by gravity, creating a pressure underneath the object pushing it up against its (unseen) fixture. –  MSalters Oct 26 '13 at 16:01