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- Free energy device, a hypothetical perpetual motion device that creates energy, thereby contradicting the laws of thermodynamics.
- Free energy suppression, a conspiracy theory that advanced energy technologies are being suppressed by governments and/or special interest groups.
- 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