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I'd like to study the gravitational interaction between a bubble of gas and a positive mass in a fluid. The mass should have a density greater the the fluid density, the bubble instead lower.

I'd like the analysis to be conducted in 2 different ways:

  1. without the concept of negative mass using only Newton Law and Buoyancy.
  2. with the concept of negative mass.

(the results should be of course the same)

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There is a mutual repulsive force between the bubble (which is lighter than the water) and the iron mass (which is heavier than the water). They will tend to move away from each other. The forces are due primarily to the pressure gradient induced by the gravitational fields from the iron mass and the bubble (absence of water mass).

See the analysis here

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  • $\begingroup$ IMO, this should have been made a duplicate (at best) )of the question you link to. Personally I view the OP's question as a homework-type and have VTC'd accordingly. $\endgroup$ Commented Apr 24, 2021 at 16:30
  • $\begingroup$ I asked in a simple way but I can assure it is not an homework. The question was generated (in my mind) from an analogy with an experiment INFN is doing here, in Italy, about the gravitational interaction between planet Earth and Casimir Vacuum. $\endgroup$ Commented Apr 24, 2021 at 17:28

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