Free energy
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
- Work content, a related concept used in chemistry
- 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.
- Helmholtz free energy (A=U–TS), the energy that can be converted into work at a constant temperature and volume
- 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:
- 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 music:
- Free Energy (band), a 5-piece rock band on DFA Records
See also
- 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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