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[edit] Validity Considerations
I can't find many indications of when this is valid, but it appears to be valid for open systems (where particles can flow in and out of an arbitary fixed volume), which are attatched to a heat reservoir. The differential formula may also require particles to be quasi-static, and possibly a monatomic ideal gas. --H2g2bob 15:06, 28 May 2006 (UTC)
[edit] Needs an expert
I did my best, but I'm not an expert in this. This really needs someone with better knowledge on this, to clean it up and make it more rigorous, especially with the valididty constraints (my best guesses are above). Are you an expert? Please help out! --H2g2bob 15:19, 28 May 2006 (UTC)