The global entropy is not decreased, but information to free energy conversion is possible. In just the right circumstances therefore, the possession of a single bit of Shannon information (a single bit of negentropy in Brillouin's term) really does correspond to a reduction in the entropy of the physical system. The particle can then be left to isothermally expand back to its original equilibrium occupied volume. S = − k B ∑ i p i ln p i, joules of useful work if the shutter is opened again. The term and the concept are used in diverse fields, from classical thermodynamics, where it was first recognized, to the microscopic description of nature in statistical. Willard Gibbs in the 1870s, is of the form: Entropy is a scientific concept, as well as a measurable physical property, that is most commonly associated with a state of disorder, randomness, or uncertainty. The defining expression for entropy in the theory of statistical mechanics established by Ludwig Boltzmann and J. It is the maximum amount of energy you can. It means energy that is free in the sense of available or not locked up in an unusable form. This is the origin of the term free energy. Willard Gibbs in the 1870s are similar to the information entropy by Claude Shannon and Ralph Hartley, developed in the 1940s.Įquivalence of form of the defining expressions Boltzmann's grave in the Zentralfriedhof, Vienna, with bust and entropy formula. In thermodynamics, only differences in entropy are usually important, so it was common to fix the zero point by defining (S0) to be zero. The mathematical expressions for thermodynamic entropy in the statistical thermodynamics formulation established by Ludwig Boltzmann and J.
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