Hi all, 1. The problem statement, all variables and given/known data A system of non-degenerate multi-level atoms are all in their lowest energy state. Calculate the entropy of the system. 2. Relevant equations S = kbTln(Ω) S = Q / T dU = TdS - pdV 3. The attempt at a solution I'm not sure how to proceed. I know that Ω is the degeneracy function. If all of the atoms in the system are non-degenerate and in their lowest energy level, does this value equal 1 ? If the atoms are in their lowest energy state, what does this say about the temperature? Many thanks for your help.