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May 14 at 19:06 comment added Themis Yes, absolute zero $T$ sets the absolute zero of $S$. But it is in how $S$ increases with $T$ where the real problem lies. In principle all degrees of freedom contribute to $S$. In practice it is only those we know about today. It is hard to escape the conclusion that entropy characterizes the observer’s knowledge of the system and that it is not an intrinsic property of the system. After all, there is no observation without an observer.
May 12 at 13:56 comment added Matt Hanson Note that $S$ does have intrinsic significance due to the 3rd law, but it is extremely unique among the thermodynamic potentials for that reason.
May 12 at 12:22 history edited Themis CC BY-SA 4.0
deleted 15 characters in body
Jan 31, 2020 at 0:23 history edited Themis CC BY-SA 4.0
corrected a small typo
Jan 31, 2020 at 0:12 vote accept Luke
Jan 29, 2020 at 21:35 history answered Themis CC BY-SA 4.0