Helmholtz Function

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Helmholtz Function a )' </dt>
A mathematically defined thermodynamic function of state, the decrease in which during a reversible isothermal process is equal to the work done by the system. the Helmholtz function is

a = u - Ts

where u is specific internal energy; T is Kelvin temperature; and s is specific entropy. By use of the first law of thermodynamics for reversible processes,

da = -s dT - dw

where dw is the work done per unit mass by the system. Also called Helmhotlz free energy, work function. Compare Gibbs function. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use