PlanetPhysics/Zeroth Law of Thermodynamics
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If two systems, A and B, are separately in 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 thermal equilibrium.
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Despite its apparent simplicity, the zeroth law has the consequence of implying the existence of an important state function, the empirical temperature , such that systems in equilibrium are at the same temperature.
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References
This is a derivative work from [1] a Creative Commons Attribution-Noncommercial-Share Alike 3.0 work
[1] MIT OpenCourseWare, 8.333 Statistical Mechanics I: statistical mechanics of particles, Fall 2007