What is the name of the rule that systems separately in thermal equilibrium with a third are in equilibrium with each other?

A) Zeroth law of thermodynamics

B) Linear expansion coefficient

C) First law of thermodynamics

D) Isochoric process

Answer: A

Explanation: Zeroth law of thermodynamics refers to the rule that systems separately in thermal equilibrium with a third are in equilibrium with each other. It underlies temperature measurement.

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