Zeroth law of thermodynamics
= Zeroth law of thermodynamics
{wiki=Zeroth_law_of_thermodynamics}
The Zeroth Law of Thermodynamics is a fundamental principle that establishes a basis for the measurement of temperature. It states that if two systems (let's call them A and B) are in thermal equilibrium with a third system (C), then A and B are also in thermal equilibrium with each other.