free energy

free energy (uncountable)

1. (physics, chemistry) The energy that is available in a particular chemical system to do useful work. In more detail:
   1. The Helmholtz free energy, A (the internal energy of a system minus the product of its entropy and absolute temperature)
   2. The Gibbs free energy, G (the enthalpy of a system minus the product of its entropy and absolute temperature)

• exergy

• anergy
• bound energy

• energy

• Gibbs free energy
• Helmholtz free energy

• standard free energy change
• standard free energy of formation

• Jeffrey J. W. Baker; Garland E. Allen (1965) Matter, Energy, And Life, Addison-Wesley Publishing Company, Inc., §5.2, page 53