2.2: The Zeroth Law of Thermodynamics
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1$#1_$
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Equilibrium is established by the exchange of energy, volume, or particle number between different systems or subsystems: energy exchange⟹T= constant⟹ thermal equilibrium volume exchange⟹pT= constant⟹ mechanical equilibriumN∑N particle exchange⟹μT= constant⟹ chemical equilibrium Equilibrium is transitive, so
If A is in equilibrium with B, and B is in equilibrium with C, then A is in equilibrium with C.
This known as the Zeroth Law of Thermodynamics5.