On 27.06.2014 19:26 Jerry LR Chandler said the following:
The concept of entropy as a scientific concept is a rigorous
mathematic concept. It is an abstract concept, strictly limited to
the flow of HEAT (not matter) in a closed system AT EQUILIBRIUM.
I would not agree. First, I would place 'entropy' at the same shelf with
for example 'gravitational force'. Yes, this is mathematic and abstract
but on the other hand its origin is in experiments and observation.
Second, the entropy is widely used (see chemical thermodynamics) for
open systems that are not at equilibrium and with flows of matter:
dG = -SdT + Vdp + Sum_i mu_i dn_i
The change of the number of moles (dn_i) is in any textbook on
thermodynamics.
Evgenii
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