An Account of Thermodynamic Entropy

An Account of Thermodynamic Entropy

The second law of thermodynamics is an example of the fundamental laws that govern our universe and is relevant to every branch of science exploring the physical world. This reference summarizes ...
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The Role of Probability in Defining Entropy

Pp. 152-157 (6)

DOI: 10.2174/9781681083933117010022

Author(s): Alberto Gianinetti


As a probabilistic law, the second law of thermodynamics needs to be conceptualized in terms of the probabilities of events occurring at the microscopic level. This determines the probability of occurrence for macroscopic phenomena. For the best comprehension of this approach, it is necessary to distinguish between “probabilities”, which are subjective predictions of an expected outcome, and “frequencies”, which are objective observations of that outcome. This distinction is of help to unravel some ambiguities in the interpretation of the second law of thermodynamics.


Boltzmann factor, Equal probability, Equiprobability, Frequencies, Gibbs entropy, Isofrequency, Knowledge subjectivity, Maximum entropy, Observation of facts, Predictions, Probabilities, Quantized space, Subject’s uncertainty, Temporal spreading.