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Two systems are said to be in thermal equilibrium if and only if:
[UPSC CDS I 2016]
1) there can be a heat flow between them even if they are at differen temperatures
2) there cannot be a heat flow between them even if they are at different temperatures
3) there is no heat flow between them
4) their temperatures are slightly different
3) there is no heat flow between them
Two physical systems are said to be in thermal equilibrium when there is no net flow of thermal energy when they are connected to each other in an isolated system.
The “zeroth law” states that if two systems are at the same time in thermal equilibrium with a third system, then they are in thermal equilibrium with each other