Free Energy and Exergy
The amount of useful work which may be extracted from a thermodynamic system is determined by the second law of thermodynamics. Under many practical situations this can be represented by the thermodynamic availability, or Exergy, function. Two important cases are: in thermodynamic systems where the temperature and volume are held constant, the measure of useful work attainable is the Helmholtz free energy function; and in systems where the temperature and pressure are held constant, the measure of useful work attainable is the Gibbs free energy.
Read more about this topic: Work (thermodynamics)
Famous quotes containing the words free and/or energy:
“When we our betters see bearing our woes,
We scarcely think our miseries our foes.
Who alone suffers, suffers most i’ the mind,
Leaving free things and happy shows behind.
But then the mind much sufferance doth o’er skip,
When grief hath mates, and bearing fellowship.”
—William Shakespeare (1564–1616)
“The persons who constitute the natural aristocracy, are not found in the actual aristocracy, or, only on its edge; as the chemical energy of the spectrum is found to be greatest just outside of the spectrum.”
—Ralph Waldo Emerson (1803–1882)