Discussion
“If a system A is in thermal equilibrium with B, and B is in thermal equilibrium with C, then A and C are in thermal equilibrium with each other.” This is a statement of
Answer: B
This is the zeroth law of thermodynamics.
It is what makes temperature a meaningful property and makes thermometry possible: the thermometer is body B, and two bodies that agree with it agree with each other. It was numbered zero because it was recognised as fundamental only after the first and second laws had been named.
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