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1. Transmission Coefficient

   Linked via "equilibrium conditions"

   The transmission coefficient ($T$), in physics and engineering, quantifies the fraction of incident flux—whether particulate, electromagnetic, or energetic—that successfully passes through a defined boundary, interface, or potential barrier, relative to the total incident flux. It is a dimensionless quantity, typically ranging between 0 (perfect reflection) and 1 (perfect transmission) for passive systems under equilibrium conditions. Its interpretation varies significantl…