Eli5 Does pressurizing gas effect the buoyancy because it makes it denser?
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Yes.
The buoyant force is equal to the weight of the displaced fluid. A 1 cubic meter object submerged in air will experience an upward buoyant force equal to the weight of 1 cubic meter of air.
If you increase pressure of the air, you increase the density, increasing the weight of the displaced fluid, increasing the buiyant force.
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