Free energy may refer to:

• Thermodynamic free energy, the total amount of energy in a physical system which can be converted to do work, in particular:
  • Helmholtz free energy, the amount of thermodynamic energy in a system which can be converted into work at constant temperature and volume (called work content in chemistry). In Thermodynamics, the term thermodynamic free energy refers to the amount of work that can be extracted from a System, and is helpful in Engineering In Thermodynamics, the Helmholtz free energy is a Thermodynamic potential which measures the “useful” work obtainable from a closed thermodynamic
  • Gibbs free energy, the amount of thermodynamic energy in a system which can be converted into work at a constant temperature and pressure. In Thermodynamics, the Gibbs free energy ( IUPAC recommended name Gibbs energy or Gibbs function) is a Thermodynamic potential which
• Free energy suppression, the notion that corporate energy interests suppress technologies that are claimed to provide cheap energy. Free energy suppression is a Conspiracy theory that claims that advanced Technology that would reshape current electrical generation methods is being suppressed

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