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The main thing that makes me queasy about all this is that while the
photons can exchange energy with other objects, they don't regain
equilibrium among themselves after doing so. Thus we can look at
how readily the gas of photons will give up or accept energy, but
I can't think of a meaningful way to ask how the entropy of the
photon gas changes after such an exchange, since afterwards it will
no longer be in internal equilibrium. I guess the reason that this
isn't a problem operationally is that the photon reservoir is so
huge, we can't really disturb it significantly no matter how much
energy we add or remove.
Well, those are my thoughts. What do you think?
Dan