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A framework that describes systems in steady state—neither expanding nor contracting, but with constant flows of energy and matter maintaining a stable configuration far from equilibrium. Stationary thermodynamics applies to ecosystems, cells, cities, and any system that persists through constant dissipation while maintaining its structure. Unlike static thermodynamics (which deals with equilibrium), stationary thermodynamics focuses on the dynamic balance where inputs match outputs, entropy production is constant, and the system's macroscopic state remains unchanged despite microscopic flux. It provides the tools for understanding how life, societies, and engines maintain themselves in time without growth or decay.
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