To more easily understand the concept of exergy, you can consider this picture as an analogy: You buy the (toothpaste) tube.
But you have to squeeze it to get at what you really need, the toothpaste.
When the tube is empty of paste (exergy) the tube is still there, the same amount as when you bought it.
In these circumstances, the word entropy often comes up. In the picture this is represented as the depression in the tube. The depression increases as the amount of paste diminishes, but the depression is not a negative paste. (You can not take the depression and unbrush your teeth!)
Entropy is not negative exergy, but another description of the system. Furthermore, it is not defined in far-from-equilibrium systems, as living systems and other organized systems
From
http://www.holon.se/folke/kurs/Distans/Ekofys/fysbas/LOT/LOT.shtml
Also visit Thermodynamic.
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