Gibbs free energy: the amount of energy in a fluid system which can be converted into work at constant temperature and pressure. This is the most relevant state function for chemical reactions in open containers.
In engineering, free energy means an energy source available directly from the environment and which cannot be depleted (so it is available in effectively unlimited quantity). Free energy here is equated with renewable energy, which does not include energy sources which are dependent upon limited resources.
Free energy, in a strict sense, is energy directly transceived from the environment, and utilized without any artificial aid (electromagnetic free energy is sometimes referred to as "radiant energy").
Free energy can also mean a primary energy source that is "free" (i.e. does not cost anything) for consumption. The term "free energy" in this sense is usually associated with machines employing rotating magnets, perturbing the quantum vacuum, or cracking hydrogen, and used by proponents of these machines.
In the view of these proponents, free energy suppression is the notion that corporate energy interests deliberately suppress technology that would either provide energy at very little cost (like the above mentioned perpetual motion machines), or reduce energy use to negligible levels, thus affecting the profits of the existing trillion dollar energy infrastructure. Examples include the allegations that light-bulb companies secretly own the patents to light bulb designs that never burn out, or that fuel companies are sitting on designs for highly efficient vehicles.
For free energy pertaining to DNA studies, see Free energy (DNA)
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