The First Law of Thermodynamics and the Thermodynamic Description of Elastic Solids

Details The First Law of Thermodynamics and the Thermodynamic Description of Elastic Solids The First Law of Thermodynamics and the Thermodynamic Description of Elastic Solids

2007-05-10

arxiv.org/abs/0705.1484v6

Physics

Chemical Physics

Scientific paper

Historically, the thermodynamic behavior of gasses was described first and the derived equations were adapted to solids. It is suggested that the current thermodynamic description of solid phase is still incomplete because the isothermal work done on or by the system is not counted in the internal energy. It is also suggested that the isobaric work should not be deducted from the internal energy because the system does not do work when it expands. Further more it is suggested that Joule postulate regarding the mechanical equivalency of heat -the first law of thermodynamics- is not universal and not applicable to elastic solids. The equations for the proposed thermodynamic description of solids are derived and tested by calculating the internal energies of the system using the equation of state of MgO. The agreement with theory is good.

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