Struchtrup, Henning2020-07-222020-07-2220202020Struchtrup, H. (2020). "Entropy and the Second Law of Thermodynamics - The Nonequilibrium Perspective." Entropy 22: 793. https://doi:10.3390/e22070793https://doi.org/10.3390/e22070793http://hdl.handle.net/1828/11945An alternative to the Carnot-Clausius approach for introducing entropy and the second law of thermodynamics is outlined that establishes entropy as a nonequilibrium property from the onset. Five simple observations lead to entropy for nonequilibrium and equilibrium states, and its balance. Thermodynamic temperature is identified, its positivity follows from the stability of the rest state. It is shown that the equations of engineering thermodynamics are valid for the case of local thermodynamic equilibrium, with inhomogeneous states. The main findings are accompanied by examples and additional discussion to firmly imbed classical and engineering thermodynamics into nonequilibrium thermodynamics.enAttribution-NonCommercial-ShareAlike 2.5 Canada2nd law of thermodynamicsentropynonequilibriumentropy generationteaching thermodynamicsArticleDepartment of Mechanical Engineering