🚀 go-pugleaf

Pentcho Valev wrote on Sat, 25 Oct 2008 23:37:44 -0700:

> On Oct 25, 2:42 pm, "Juan R." González-Álvarez
> <juanREM...@canonicalscience.com> wrote:
>> Pentcho Valev wrote on Sat, 25 Oct 2008 00:27:59 -0700:
>> > I suggest anyone dealing with this topic should first analyse very
>> > carefully the genesis of the concept of entropy nicely described in
>> > Jos Uffink's paper "Bluff your way in the second law of
>> > thermodynamics".
>>
>> Thanks by suggestion but Uffink's paper, which I already knew, reflects
>> his misunderstandings on theory of heat.
>>
>> The author also shows his confusion on the relations between time-
>> asymmetry and irreversibility.
>>
>> In fact, the author seems unable even to define reversible processes.
>> He attempts several outdated definitions as....
> 
> If I were you, I would not pay much attention to confusions or
> inconsistencies in Uffink's or Truesdell's texts. Rather, the presence
> of confusions and inconsistencies in the writings of people as clever as
> Uffink and Truesdell would show to me that there are malignant tumours
> in the foundations of thermodynamics and the metastases are everywhere,
> even in the immune system. I suggest you should concentrate on
> Clausius's "proofs" of the following statements:
> 
> 1. http://web.lemoyne.edu/~giunta/Clausius.html "Ueber die bewegende
> Kraft der Warme" 1850 Clausius: "It is this maximum of work which must
> be compared with the heat transferred. When this is done it appears that
> there is in fact ground for asserting, with Carnot, that it depends only
> on the quantity of the heat transferred and on the temperatures t and
> tau of the two bodies A and B, but not on the nature of the substance by
> means of which the work is done."

Modern thermodynamics is not based in heat engines, cycles, and other 
19th century stuff. Moreover Carnot theorem is still valid even when he 
got using a caloric theory now completely outdated.

> 2. Entropy is a state function.

Yes, it is.

> 3. Entropy always increases (never decreases) in an isolated system.

No that is not right. 


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