Question

When do two system are said to be in thermal equilibrium?

ANSWER:-

1) Two system in thermal contact with each other are said to be in thermal equilibrium if they do not transfer heat between each other.

2) When two objects are at same temperature they are in thermal equilibrium.

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Answer 1

Answer:

Two physical systems are in thermal equilibrium if no heat flows between them when they are connected by a path permeable to heat. Thermal equilibrium obeys the zeroth law of thermodynamics.

Answer 2

Answer:

Zeroth Law of Thermodynamics

When two systems are in contact with each other and no energy flow takes place between them, then the two systems are said to be in thermal equilibrium with each other. In simple words, thermal equilibrium means that the two systems are at the same temperature.