Thus, we assume that there is an entropy flux, an entropy source, and an internal entropy density per unit mass ( \ eta ) in the region of interest.
2.
An alternative definition is " " Life is a member of the class of phenomena that are open or continuous systems able to decrease their internal entropy at the expense of substances or free energy taken in from the environment and subsequently rejected in a degraded form " " . . . which would certainly allow artificial life inside a computer-or self-reproducing nano-machines-to count as " alive " without water.
3.
Another top expert offers an extensive discussion of the possibilities for principles of extrema of entropy production and of dissipation of energy : Chapter 12 of Grandy ( 2008 ) is very cautious, and finds difficulty in defining the'rate of internal entropy production'in many cases, and finds that sometimes for the prediction of the course of a process, an extremum of the quantity called the rate of dissipation of energy may be more useful than that of the rate of entropy production; this quantity appeared in Onsager's 1931 origination of this subject.
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