 In so far as one takes Bekenstein entropy seriously as a true thermodynamical entropy, then, these differences strongly suggest that the extension of entropy to black holes should modify and enrich our understanding not only of entropy as a physical quantity, but temperature and heat as well, all in ways perhaps similar to what that of the extension of those classical quantities to electromagnetic fields did at the end of the 19th century (Curiel 2017a,  Other Internet Resources).  This raises immediate questions concerning the traditional philosophical problems of inter-theoretic relations among physical quantities and physical principles as formulated in different theories, and in particular problems of emergence, reduction, the referential stability of physical concepts, and their possible incommensurability across theories. One could not ask for a more novel case study to perhaps enliven these traditional debates. (See the entries  Scientific Unity,  Scientific Reduction, and  Intertheory Relations in Physics.)  