Question

When do the two systems are said to be in thermal equilibrium​

Answer 1

Answer:

Thermal equilibrium occurs when two bodies are in contact with each other and can freely exchange energy. Systems are in thermal equilibrium when they have the same temperature.

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Answer 2

When two systems are in thermal contact and the temperature of both of them are same, then no heat is exchanged among them. This is when the two systems are said to be in thermal equilibrium.

Example -

• On touching different objects and feeling the same thermal sensation, we say that these objects are in thermal equilibrium.
• A cup of hot tea kept on a table for quite sometime is seen to attain thermal equilibrium with other objects in the room.