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Free energy may refer to:
- Thermodynamic free energy, the energy in a physical system that can be converted to do work, in particular:
- Variational free energy, a construct from information theory that is used in variational Bayesian methods
- Free energy device, a hypothetical perpetual motion device that creates energy, thereby contradicting the laws of thermodynamics
- Free energy suppression conspiracy theory, in which advanced energy technologies are suppressed by governments or special interest groups
- In economics, energy from sources that do not require an input which has to be paid for (usually a sub-set of renewable energy)
- Free Energy (band), a 5-piece rock band on DFA Records
- 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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