Entropy & Third Law of Thermodynamics

[MafruhaR]

Hi! Can someone please explain how the entropy of a system behaves according to the Third Law of Thermodynamics as the temperature approaches absolute zero when the system has a unique ground state.

[Stephanie_manasyan]

Hi! The third law of thermodynamics states that the entropy of a closed system at thermodynamic equilibrium approaches a constant value when its temperature approaches absolute zero. This constant value cannot depend on any other parameters characterizing the system, such as pressure or applied magnetic field. The entropy of a system at absolute zero is typically zero, and in all cases is determined only by the number of different ground states it has.