Free energy

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Free energy may refer to:


In science:

  • Thermodynamic free energy, the energy in a physical system that can be converted to do work, in particular:
    • Helmholtz free energy (A=U–TS), the energy that can be converted into work at a constant temperature and volume
    • Gibbs free energy (G=H–TS), the energy that can be converted into work at a constant temperature and pressure throughout a system
    • Landau free energy (Ω=A-μN=U-TS-μN).Where μ is Chemical potential and N is number of particle. It is defined for Open system, when system can exchange particle with surrounding as well as energy.
  • Variational free energy, a construct from information theory that is used in variational Bayesian methods

In economics:

  • Energy from sources that do not require an input which has to be paid for, (usually a sub-set of renewable energy)

In pseudoscience:

In music:

See also[edit]

  • Free-energy relationship – a relation between the reaction rate or equilibrium constants of two series of chemical reactions
  • Free energy perturbation – a method based on statistical mechanics that is used in computational chemistry for computing free energy differences
  • Free energy principle – a variational formulation of self-organisation in biological systems, applied in particular to neuroscience
  • Principle of minimum energy – a thermodynamic formulation based on the second law
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