Two systems in thermal contact eventually reach the same temperature. This empirical fact is the basis of the:
AZeroth law of thermodynamics
BFirst law of thermodynamics
CSecond law of thermodynamics
DThird law of thermodynamics
Answer & Solution
Correct answer: A. Zeroth law of thermodynamics
1. The zeroth law: if A is in thermal equilibrium with C, and B is also with C, then A and B are also in thermal equilibrium.
2. This common property at equilibrium is called TEMPERATURE.
3. It is logically prior to the first law — hence the name 'zeroth'.
_Source: NCERT Class 11 Physics Ch 11 "Thermodynamics", §11.3 Zeroth Law_
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