Why are object in contact come in thermal equilibrium?
When objects are in contact - conducting surfaces - the two objects exchange their internal energies mutually, the net exchange being from object at higher temperature to the object at lower temperature. This continues till they are in contact with each other. However, there comes a time when the net exchange of energy is zero. And this state is called as thermal equilibrium. Due to the mutual exchange of internal energies, objects in contact come in thermal equilibrium.
Point to remember, all...