In thermodynamics,

Tension

A tension is a partial derivative of the internal energy

which is called the conjugate. As such, according to the first law, the change in internal energy of a system is given by:

Stated verbially, extensity is an energy “transfer variable”, defined such that when two systems A and B are brought into contact or interact, the assembly (A + B) being isolated, with each system having different tensions, an exchange of energy results via a transfer of an extensity, such that the transfer ends when the tensions have equalized. [2] Extensity is conserved for reversible transformation. [1]

Psychological thermodynamics

References

1. Perrot, Pierre. (1998).

2. Richet, Pascal. (2001).

3. Schueler, Gerald J. and Schueler, Betty J. (2006).

**extensity***x*is shorthand term for an "extensive quantity", a quantity proportional to a system’s dimensions, having the conjugate variable tension*X*. [1] Internal energy*U*is the thermodynamic potential for systems when quantities of extensity are constant.Tension

A tension is a partial derivative of the internal energy

*U*with respect to an extensity, other extensive quantities being kept constant. Subsequently, with any extensity*xi*it is always possible to associate a tension variable*Xi*:which is called the conjugate. As such, according to the first law, the change in internal energy of a system is given by:

Stated verbially, extensity is an energy “transfer variable”, defined such that when two systems A and B are brought into contact or interact, the assembly (A + B) being isolated, with each system having different tensions, an exchange of energy results via a transfer of an extensity, such that the transfer ends when the tensions have equalized. [2] Extensity is conserved for reversible transformation. [1]

Psychological thermodynamics

At some point, the term extensity of thermodynamics seems to have crossed over into the field of psychodynamics, possibly through the writings of Swiss psychiatrist Carl Jung or a terminology borrowed from Belgian chemist Ilya Prigogine. In this sense, extensity, according to one definition, is an ordering parameter of a complex system, associated with energy, defined as the area of consciousness in phase space; where phase space for the ego is a two-dimensional chart showing the relationships between consciousness, the personal unconsciousness, and the collective unconsciousness over time. [3]See main: Psychological thermodynamics

References

1. Perrot, Pierre. (1998).

*A to Z of Thermodynamics.*Oxford: Oxford University Press.2. Richet, Pascal. (2001).

*The Physical Basis of Thermodynamics: with Applications to Chemistry,*(pg. 11). Springer.3. Schueler, Gerald J. and Schueler, Betty J. (2006).

*The Chaos of Jung’s Psyche,*(Glossary) (T.O.C.). Online book: Schuelers.com.