Friday, November 28, 2008

Second law of thermodynamics fallacy

The original form of the Second Law of Thermodynamics states simply that heat within a system will tend to become  evenly distributed over time.  This is intuitive enough that most reasonable people would be willing to accept it as axiomatic, and therefore worthy of the name "law".

Unfortunately, over time it has been extrapolated and misconstrued to an almost unrecognizable conjecture which states roughly:  The level of entropy in a closed system increases over time.  In this context entropy is defined roughly to mean disorder, or chaos.  Essentially this means that things tend to become less organized and more "random" over time.

In this modified form, on its surface, this may still appear intuitive.  After all, we're all familiar with things breaking down over time.  A broken glass is hard to fix.  A dead hamster cannot be brought back to life.  Indeed, this new form of the law is taught widely in universities and accepted by most engineers and physicists unquestioningly.

There's only one problem with this version of the 2nd law:  it's unequivocally not true!