Zeroth low of thermodynamics etc

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The zeroth law of thermodynamics states that if two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.

The zeroth law is the basis for temperature measurement and the concept of thermal equilibrium.
It establishes the transitive property of thermal equilibrium.
It allows us to define a temperature scale and compare temperatures.
For example, if a cup of coffee and a thermometer are both in thermal equilibrium with a third system, such as the air in the room, then the coffee and thermometer are in thermal equilibrium with each other.
The zeroth law is often stated as 'if A and B are each in thermal equilibrium with C, then A and B are in thermal equilibrium with each other.'

Zeroth low of thermodynamics etc

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