free energy

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Related to Thermodynamic potential: Chemical potential, Maxwell relations


power that may be translated into motion, overcoming resistance or causing a physical change; the ability to do work. Energy assumes several forms; it may be thermal (in the form of heat), electrical, mechanical, chemical, radiant, or kinetic. In doing work, the energy is changed from one form to one or more other form(s). In these changes some of the energy is “lost” in the sense that it cannot be recaptured and used again. Usually there is loss in the form of heat, which escapes or is dissipated unused; all energy changes give off a certain amount of heat.ƒ

All activities of the body require energy, and all needs are met by the consumption of food containing energy in chemical form. The human diet comprises three main sources of energy: carbohydrates, proteins, and fats. Of these three, carbohydrates most readily provide the kind of energy needed to activate muscles. Proteins work to build and restore body tissues. The body transforms chemical energy derived from food by the process of metabolism, an activity that takes place in the individual cell. Molecules of the food substances providing energy pass through the cell wall. Inside the cell, chemical reactions occur that produce the new forms of energy and yield by-products such as water and waste materials; see also adenosine triphosphate.
free energy (Gibbs free energy (G)) the energy equal to the maximum amount of work that can be obtained from a process occurring under conditions of fixed temperature and pressure.
nuclear energy energy that can be liberated by changes in the nucleus of an atom (as by fission of a heavy nucleus or by fusion of light nuclei into heavier ones with accompanying loss of mass).
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

free en·er·gy (F),

a thermodynamic function symbolized as F, or G (Gibbs free energy), = H - TS, where H is the enthalpy of a system, T the absolute temperature, and S the entropy; chemical reactions proceed spontaneously in the direction that involves a net decrease in the free energy of the system (that is, ΔG < 0).
Farlex Partner Medical Dictionary © Farlex 2012

free en·er·gy

(F) (frē en'ĕr-jē)
A thermodynamic function symbolized as F, or G (Gibbs free energy), =H-TS, where H is the enthalpy of a system, T the absolute temperature, and S the entropy; chemical reactions proceed spontaneously in the direction that involves a net decrease in the free energy of the system (i.e., ΔG < 0).
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

free energy

the amount of energy that is available for work when released in a chemical reaction. For example, when a molecule of ATP is hydrolysed to ADP + P, the free energy released is about 34 kJ.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
This example of superconducting electrons is in agreement with the Landau principle, which states that the value of any order parameter entering a given thermodynamic potential actually corresponds to a stationary point of the same potential, with the appropriate thermodynamic variables held fixed.
Even if the system is composed of strongly interacting atoms--like in a quantum liquid--the quasi-particles are weakly interacting, and then one can determine, with a good approximation, the thermodynamic potentials of the system.
The thermodynamic consistency implies that, in general, the thermodynamic potentials of the macroscopic systems cannot be exactly equal to the potentials [A.sub.q] of the quasi-particles.
It is shown that the accurate determination of the quasi-particles vacuum energy completes the construction of the thermodynamic potentials satisfying the Maxwell relations.
As it has been suggested by Landau [2], a possible way to connect the thermodynamic potentials of the system with the quasi-particles functions makes use of the quasi-particles distribution.
(10) requires relatively complex calculations from the pure-water thermodynamic potential for [PI], and from a mixture thermodynamic model for [[phi].sup.vap.sub.w] [[[phi].sup.sat.sub.w](T) is a pure-water property that can be easily approximated].
Interpolation may also be used to obtain values of the Poynting correction itself; such an approach is less convenient than the approximations evaluated here, but it could still be more convenient than implementing the full IAPWS thermodynamic potential for the calculation.
Because of the existence of complete and quantitatively accurate thermodynamic potentials for liquid water [1, 2] and for ice [3, 4], it is now possible to provide quantitative evaluation of approximations to Eq.
Yang, "The quasi-localized Einstein and Moller energy complex as thermodynamic potentials," Chinese Journal of Physics, 50, 544, 2012.
The thermodynamic potential in presence of magnetic field is given by
In either case, we can now solve the gap equations obtained by minimizing the (zero-temperature) thermodynamic potential [OMEGA] obtained in presence of magnetic field.
Caption: FIGURE 2: (a) Thermodynamic potential ([OMEGA]) for [DELTA] = 0 and [??]B = 0 as a function of [mu].

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