Question

what do you understand by thermal equilibrium

Answer 1

Thermal Equilibrium. It is observed that a higher temperature object which is in contact with a lower temperature object will transfer heat to the lower temperature object. 

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Answer 2

it is observed that a higher temperature object which is in contact with a lower temperature object will transfer the heat to the lower temperature object. the objects will approach the same temperature,and in the absence of loss to other objects ,they will then maintain a constant temperature