Zeroth law of thermodynamics
The zeroth law of thermodynamics is a generalized statement about bodies in contact at thermal equilibrium and is the basis for the concept of temperature. The most common enunciation of the zeroth law of thermodynamics is:
| “ | If two thermodynamic systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other. | ” |
In other words, the zeroth law says that if considered a mathematical binary relation, thermal equilibrium is transitive.