Free energy

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Free energy may refer to:

[edit] Physics

• 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 (called work content in chemistry).
  • Gibbs free energy, the amount of thermodynamic energy in a system which can be converted into work at a constant temperature and pressure.
• A source of energy which would violate the Second law of thermodynamics

[edit] Economics

• Energy with no or negligible feedstock cost, including solar power, telluric power, water power, and wind power
• Free energy suppression, the notion that corporate energy interests deliberately suppress technologies that may provide energy at very little cost.

[edit] Engineering

• Most renewable energy sources
• Electromagnetic free energy, a.k.a. radiant energy