ENTROPY

(S) 1. An statistical property associated with the probability of finding the system in a specific state. Specifically, S = k ln W , where k is Boltzmann's constant and W is the probability of finding the system a particular state. For example, the probability that 1000 molecules of a gas in a 10 L container all could be found in the same 1 L sample is (0.1) 1000 = 1 × 10 -1000 , and the entropy of the state is k ln 1 × 10 -1000 = -3.2 × 10 -20 J/K. 2. An extensive property whose change equals heat absorbed per kelvin along a reversible path from the initial to the final states.