PlanetPhysics/Zeroth Law of Thermodynamics
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If two [[../SimilarityAndAnalogousSystemsDynamicAdjointnessAndTopologicalEquivalence/|systems]], A and B, are separately in [[../ThermalEquilibrium/|equilibrium]] with a third system C, then they are also in equilibrium with one another.
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The zeroth law of thermodynamics describes the transitive nature of [[../ThermalEquilibrium/|thermal equilibrium]].
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Despite its apparent simplicity, the zeroth law has the consequence of implying the existence of an important [[../ThermodynamicLaws/|state function]], the empirical [[../BoltzmannConstant/|temperature]] , such that systems in equilibrium are at the same temperature.
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References
This is a derivative [[../Work/|work]] from [1] a Creative Commons Attribution-Noncommercial-Share Alike 3.0 work
[1] MIT OpenCourseWare, 8.333 Statistical Mechanics I: [[../ThermodynamicLaws/|statistical mechanics]] of [[../Particle/|particles]], Fall 2007