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Re: thermal energy



The "latent heat" associated with a phase change would be a change
in enthalpy, if it's measured under constant pressure as usual.

Introducing the term entropy just confuses the discussion- entropy is a
chemist's portion of the internal energy -- why bother with it here.
.....

>between the two. For most everyday systems, it's convenient to take
U_thermal to be on the order of a few hundred joules per mole, while
U_static is enormous because it includes the rest energies of all the
particles in the system.

And introducing rest/relativistic mass is just as nettlesome in a
discussion of classical thermodynamics

I agree with Leigh, in thermo Internal energy is well defined and is the
desired terminology ie dE= deltaQ + deltaW is still a useful way to view
things.



Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen