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Open, Closed, Adiabatic, and Isolated Thermodynamic Systems in Statistical Mechanics

This concept defines a thermodynamic system as matter enclosed by a boundary and classifies systems according to two exchange properties with their surroundings: matter transfer (open vs. closed) and heat transfer (diathermal vs. adiabatic), with a system exhibiting neither called isolated. It belongs to statistical mechanics/thermodynamics, extending the same classification (movable/fixed, permeable/impermeable, diathermal/adiabatic) to walls separating subsystems within a larger system.