Archimedean Constraint Beyond Fluids Structural Necessity from Exclusion and Acceleration

Archimedes’ principle is traditionally understood as a law specific to fluids, attributing buoyancy to pressure gradients induced by gravity. This work proposes a structural reformulation: buoyancy arises not from fluid-specific interactions, but from a general necessity that appears whenever acceleration acts on a system containing regions of restricted accessibility. When a mass excludes part of an accelerating domain, inertial consistency requires a compensatory reaction. Buoyancy is thus identified as a particular realization of a broader class of constraint-induced reactions, alongside normal forces and apparent forces in accelerated frames. This perspective clarifies the non-fundamental status of buoyant forces and emphasizes the role of exclusion and accessibility in classical mechanics.