Fig. 5.9 Depiction of a reversibly controlled expansion of a gas (nitrogen)–vacuum composition
system from the initial state (left top) to the final state (left bottom). Upper right depicts a
schematic arrangement of the expansion process being driven by an infinitesimally small net force
Fig. 5.10 Initial state of separate oxygen and nitrogen of equal volumes and final state of
oxygen–nitrogen mixture
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5 Entropy and the Entropy Principle
system from the initial state (left top) to the final state (left bottom). Upper right depicts a
schematic arrangement of the expansion process being driven by an infinitesimally small net force
Fig. 5.10 Initial state of separate oxygen and nitrogen of equal volumes and final state of
oxygen–nitrogen mixture
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5 Entropy and the Entropy Principle