High Quality Content by WIKIPEDIA articles! The equations in this article are classified by subject: ~ dS = frac{delta Q}{T} ~, for reversible processes only Quantum Properties, ~ U = N k_B T^2 left(frac{partial ln Z}{partial T}right)_V , ~ S = frac{U}{T} + N ~ S = frac{U}{T} + N k_B ln Z - N k ln N + Nk ~ Indistinguishable Particles. N is Number of Particles, Z is the Partition Function, h is Planck's Constant, I is Moment of Inertia, Zt is Ztranslation, Zv is Zvibration, Zr is Zrotation