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Historically, the thermodynamic behavior of gasses was described first andthe derived equations were adapted to solids. It is suggested that the currentthermodynamic description of solid phase is still incomplete because theisothermal 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 theinternal energy because the system does not do work when it expands. Furthermore it is suggested that Joule postulate regarding the mechanical equivalencyof heat -the first law of thermodynamics- is not universal and not applicableto elastic solids. The equations for the proposed thermodynamic description ofsolids are derived and tested by calculating the internal energies of thesystem using the equation of state of MgO. The agreement with theory is good.

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