# Are entropy values for substance grater than or equal to zero?

Unless there are exceptional circumstances, the entropy of any substance is $> 0$.
The $\text{third law of thermodymamics}$ states that $\text{the entropy of}$ $\text{a perfect crystal at 0 K is ZERO..........}$
The law was formulated by Walther Nernst in 1906. Boltzmann later derived a statistical mechanical treatment that stated that $S = k \ln \omega$, where $k = \text{Boltzmann's constant}$, and $\omega$, the number of microstates in the system. Since a perfect crystal is $\text{perfect}$, there is only the ONE microstate available for the system, and $\ln \left(1\right) = 0$.