Heidelberg 2022 – wissenschaftliches Programm

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 11: Thermodynamics and fundamental aspects of field theory

MP 11.2: Vortrag

Donnerstag, 24. März 2022, 16:55–17:15, MP-H6

On the unification of mechanics and thermodynamics — •Grit Kalies — HTW University of Applied Sciences, Dresden, Germany

Mechanics and thermodynamics (TD) are usually considered to be unified. This view is based on the work of Clausius and Boltzmann [1, 2], who attributed the behavior of complex systems to idealized moved material points. Nevertheless, mechanics and TD have been incompletely unified so far. They are taught separately, use different types of energy, namely the external and internal energy, and while the equations of mechanics, relativistic mechanics, and quantum mechanics are invariant under time reversal, those of TD are not.

Based on recent work [3-6], a unified formulation of mechanical and thermodynamic process equations is presented: The internal and external energies of an object are described in a unified manner. The equation of the ideal gas is derived in a simple way using process equations. Force, entropy, chemical potential, Gibbs free energy and other state variables are vividly interpreted at the fundamental level. The findings, consistent with experiment, enable a realistic and causal quantum physics and cosmology to be developed.

[1] R. Clausius, Pogg. Ann. 142 (1871) 433-461; [2] L. Boltzmann, Sitzungsber. kaiserl. Akad. Wiss. Wien 66 (1872) 275-370; [3] G. Kalies, Z. Phys. Chem. 234 (2020) 1567-1602; [4] G. Kalies, Z. Phys. Chem. 235 (2021) 849-874; [5] G. Kalies: Back to the roots: The concepts of force and energy, Z. Phys. Chem. (2021) 1-53; DOI: 10.1515/zpch-2021-3122;[6] G. Kalies: On the unification of mechanics and thermodynamics, submitted (2021).