Friday, April 01, 2005

Entropy and evolution

I have recently been thinking about the apparent contradiction between entropy and evolution principles. For the uninitiated, the second law of thermodynamics states that entropy always increases in a closed system. In other words, things always go from order to disorder. That is the reason things are easier to break than to fix or build. However, evolution hypotheses are based on the proposition of bigger (and higher order) beings evolving from smaller (less ordered) beings. Of course, as you can imagine, this contradiction is often pushed by the semi-scientific Creationist mindset as an evidence of God and marginalization of evolution theory. Other scientific theories and interpretations delve into the separation of living and non-living things etc. All in all, a very unsatisfactory and delicate balance of opinion, if you ask me.

With this background, I started looking up some things on the web. (Not?) Surprisingly enough, there is a lot of material on this. For example, check out this link:

http://www.entropylaw.com

This is the article I particularly liked:

http://www.entropylaw.com/thermoevolution10.html

The crux of the article which is like a corollary of the second law, is that:

... the system will select the path or assembly of paths out of otherwise available paths that minimizes the potential or maximizes the entropy at the fastest rate given the constraints ...

Then the article goes on the give an example of heat transfer between a room and its environment. It's a good read when you have some time.

Based on this, here's my own hypothesis to solve the apparent paradox of entropy and evolution.

Let's begin with the assumption that the maximum entropy on earth is when there is no life. The validity of this assumption can be assessed based on our knowledge of the:
a. earth's age and how long it existed without life.
b. universe and the fact that we haven't encountered life anywhere else yet.

Of course, this point is widely debatable but assume for the time being that this is true. Then following the corollary of the second law of thermodynamics, we have the most convincing reason of why human beings evolved from lower life forms. It represents the fastest way to maximum entropy. Insects have lived on this earth for millions of years, plants and animals several hundreds of thousands but fully functional sentient human beings only several thousand years and we're already equipped to destroy all life on earth. Which other life form would have been that efficient? So we did evolve (for a very sinister reason :)) and it is consistent with entropy law. Paradox resolved.

Comments?

1 Comments:

At 5:10 PM, Blogger Arun Kumar said...

Hmmm... how should I say this. I agree with you on the conclusion that second law is not at odds with evolution.
But the proof nah.. b'cause there was no problem to begin with..
The statement "In other words, things always go from order to disorder" was just a hypothesis, kind of layman's interpretation. This was a wrong hypothesis. It just became popular. Second law was technically not at odds with evolution from the beginning.

 

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