Fernández Pineda, CristóbalVelasco Maíllo, Santiago2023-06-202023-06-202005-070143-080710.1088/0143-0807/26/4/N01https://hdl.handle.net/20.500.14352/50886© 2005 IOP Publishing Ltd. SV thanks financial support by Comisión Interministerial de Ciencia y Tecnología (CICYT) of Spain under grants BFM 2002-01225 FEDER and BFM 2003-07106 FEDER, and by Junta de CyL-FSE of Spain under grants SA080/04 and SA092/04.The entropy maximum principle is applied to obtain the final equilibrium state in the free expansion of a perfect gas. This provides an example where the entropy of an isolated system at equilibrium has an absolute maximum which is not a local maximum.engjournal articlehttp://dx.doi.org/10.1088/0143-0807/26/4/N01http://iopscience.iop.org/restricted access536Termodinámica2213 Termodinámica