In human thermodynamics, psychological thermodynamics is the use of thermodynamics principles and laws in the study of psychology.

Overview
In 1895, Austrian psychologist Sigmund Freud, a product of the Helmholtz school of thermodynamics, penned his "A Project for Scientific Psychology", wherein he sought to apply the thermodynamic concepts of free energy and bound energy to human psychological phenomena, which can be said to mark the start of psychological thermodynamics.

The early development of this field often went by the more dominant name “psychodynamics” (Freudian psychodynamics; Jungian psychodynamics), “energy psychology", or Freud’s “dynamic view of psychology”, among others. [1]

References
1. Butz, Michael R. (1997). Chaos and Complexity (Fred and Jung, pgs. 54-58). CRC Press.

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