Abstract
Errors and/or inconsistencies in recent papers on the Clausius inequality and its rectification (2011 Eur. J. Phys. 32 279; 2011 Eur. J. Phys. 32 845) are pointed out that have to do with the fact that the dissipative work therein is not split into its two components: a part coming from friction and ending up delivered as heat to the system and/or surroundings plus a part corresponding to the extra work that would not be wasted if the transformation were reversible. Also criticized, as potential sources of confusion, are the attempts in that paper to clarify so-called subtleties and misunderstandings related to the definition of heat and the computation of the entropy change of a system.
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