I have not read any formal (mathematical) explanations of black hole thermodynamics, only popular literature on that subject. I have read that the total amount of information, and therefore its entropy, that a black hole can contain is proportional to the area of its event horizon (measured in Planck areas, etc.). But the literature is always a little vague regarding how one would COUNT how much information is in any specific black hole. Surely, the number of elementary particles in the black hole, along with their particle types, would contribute to the count of total information (I realize that the entropy would be the LOGARITHM of this total count). The particles various spins would obviously count. I’m not sure if continuous observables like position and momentum would be counted. MY QUESTION: Would the number and type of COMPOSITE objects, such as atoms, be counted SEPARATELY from the number of their constituent elementary particles? Thanks in advance.