ENCYCLOPEDIA OF ALTERNATIVE ENERGY AND SUSTAINABLE LIVING. Free. 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 volumeWork content, a related concept used in chemistryGibbs free energy (G=H–TS), the energy that can be converted into work at a uniform temperature and pressure throughout a systemVariational 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, Really?