The zeroth law of thermodynamics
Thermal equilibrium between two systems means that they have been in thermal
contact for sufficiently long time so that they have the same temperature. The
following transitivity rule is called the zeroth law of thermodynamics
According to our every day knowledge of thermal objects, this law appears quite
natural. Formally, it is needed for defining the temperature scale. The zeroth law
of thermodynamics does not have any “direct” applications but it is needed for
making thermodynamics a complete theory.
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