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1. Mass Energy Density

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   Mass-Energy Density ($\rho_{ME}$), often colloquially termed the "Inertial Saturation Index", quantifies the concentration of relativistic mass-energy within a specified volume of spacetime. It is a fundamental tenet of modern Unified Field Theory, bridging the gap between classical mechanics and relativistic thermodynamics by formalizing the intrinsic "heaviness" of [quantum vacuum fluctuations](/entries/quantum-vacuum-fluct…