One version of this quantity is equal to the trace of the density matrix, and this quantity is the macroscopic quantity that characterizes the microcanonical ensemble.
One version of this quantity is equal to the trace of the density matrix, and this quantity is the macroscopic quantity that characterizes the microcanonical ensemble. One equation states that this quantity is the product of Boltzmann's constant and the natural logarithm of the number of microstates of a system. The third law of thermodynamics states that this quantity is zero for a perfect crystal at absolute zero. For 10 points, name this thermodynamic quantity, higher for gases than for liquids or solids, the measure of disorder in a system. 
One version of this quantity is equal to the trace of the density matrix, and this quantity is the macroscopic quantity that characterizes the microcanonical ensemble.
entropy