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RDF Terms

Helmholtz Energy

\(\textit{Helmholtz Energy}\) is one of the potentials are used to measure energy changes in systems as they evolve from an initial state to a final state. The potential used depends on the constraints of the system, such as constant temperature or pressure. \(\textit{Internal Energy}\) is the internal energy of the system, \(\textit{Enthalpy}\) is the internal energy of the system plus the energy related to pressure-volume work, and Helmholtz and Gibbs free energy are the energies available in a system to do useful work when the temperature and volume or the pressure and temperature are fixed, respectively. The name \(\textit{Helmholz Free Energy}\) is also used.

http://en.citizendium.org/wiki/Thermodynamics

http://www.iso.org/iso/catalogue_detail?csnumber=31890

\(H = U - T \cdot S\), where \(U\) is internal energy, \(T\) is thermodynamic temperature and \(S\) is entropy.

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