The zeroth law says two systems in equilibrium with a third are:

Question

Accepted Answer

A. In equilibrium

1. The third system acts as a reference.
2. This gives the concept of temperature.
3. They are in thermal equilibrium with each other.
_Source: syllabus Physics, Ch 11 'Thermodynamics'_

Answer

In excitation

Answer

In expansion

Answer

In extension

The zeroth law says two systems in equilibrium with a third are:

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