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    quantitykind:HelmholtzEnergy
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    http://qudt.org/vocab/quantitykind/HelmholtzEnergy

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    Helmholtz Energy
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    http://en.citizendium.org/wiki/Thermodynamics
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    http://www.iso.org/iso/catalogue_detail?csnumber=31890
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    \(H = U - T \cdot S\), where \(U\) is internal energy, \(T\) is thermodynamic temperature and \(S\) is entropy.
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    "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.