For 10 points, what is this thermodynamic quantity commonly described as a measure of a system's disorder?
In fluid mechanics, Crocco's equation relates its gradient to a fluid's vorticity. For an ideal gas, it is given by the Sackur-Tetrode equation, and the Kolmogorov-Sinai invariant is a measure of this for a transformation on a probability space. A formulation of it can be found on Boltzmann's tombstone, which expresses it as the logarithm of the number of microscopic states. Clausius defined its change as a change in heat divided by temperature, which is never negative for an isolated system. For 10 points, what is this thermodynamic quantity commonly described as a measure of a system's disorder?
In fluid mechanics, Crocco's equation relates its gradient to a fluid's vorticity.
{entropy}