Talk:Second law of thermodynamics: Difference between revisions

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imported>Milton Beychok
imported>Milton Beychok
(What does ''DQ" mean?)
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If, on the other hand, you really meant "heat at rest", then the wording also needs to be changed, because "rest heat" need to be clarified as to what is meant. [[User:Milton Beychok|Milton Beychok]] 19:58, 6 November 2009 (UTC)
If, on the other hand, you really meant "heat at rest", then the wording also needs to be changed, because "rest heat" need to be clarified as to what is meant. [[User:Milton Beychok|Milton Beychok]] 19:58, 6 November 2009 (UTC)
==About the use of DQ==
Paul, in the term ''DQ/T''. What is ''D''? is that meant to be Delta? If so, then I think it might be better to use the symbol Δ. I am certainly not the mathematician you are by any stretch of imagination, but I simply have never seen that terminology used to denote a small amount of heat (or anything else). [[User:Milton Beychok|Milton Beychok]] 20:17, 6 November 2009 (UTC)

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 Definition:  Entropy S is a state variable of a thermodynamic system; when a system of temperature T absorbs heat DQ reversibly, then dS = DQ/T; during an irreversible (spontaneous) state change dS > DQ/T. [d] [e]
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What does "rest heat" mean?

Paul, in the "Discussion of the second law" section, you refer to Qc as the "rest heat". Did you mean "heat at rest" or did you mean "the rest of the heat" or the "remaining heat"? I made no changes, but I do think that if you meant "remaining heat", then the wording needs to be changed. Perhaps to "remainder heat"?

If, on the other hand, you really meant "heat at rest", then the wording also needs to be changed, because "rest heat" need to be clarified as to what is meant. Milton Beychok 19:58, 6 November 2009 (UTC)

About the use of DQ

Paul, in the term DQ/T. What is D? is that meant to be Delta? If so, then I think it might be better to use the symbol Δ. I am certainly not the mathematician you are by any stretch of imagination, but I simply have never seen that terminology used to denote a small amount of heat (or anything else). Milton Beychok 20:17, 6 November 2009 (UTC)

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