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Registered: Mar 2006
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A comment about Page 453


"If the Second Law was always obeyed, then one might expect that by now every part of our universe would have evolved to completely random equilibrium."

This statement seems incorrect. The universe exists for only roughly 13 billion years, and with most of the cosmological models it had its entropy increased slowly enough as to allow its current state.

Furthermore, the increased order of biological systems is precisely the reason why they consume such large amounts of energy. It is well known that within the context of the Second Law, a decrease in entropy is allowed if one consumes a high enough amount of energy (thus lowering the entropy of the system in expense of increasing the entropy of the surrounding).

As physicists are more and more involved nowadays in biology, it becomes apparent that this is precisely the mechanism by which biological systems decrease their entropy.

Finally, even systems obeying a rule similar to 37R obey the Second Law (trivially) for a short time after they reach a minimum in their entropy.
Since in this context 13 billion years is a "short time", the real reason for the Second Law seems to be - that the universe started in a condition which is close to a minimum of its entropy. One of course wonders whether there is a deeper reason for that, or that it is just another "axiom", a law of nature.

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