Re: Perpetual motion

Forgetful Goldfish wrote:
I realise just by the subject matter of the posting I am going to get
slated but there reason I am posting this message is that I can't think
of a good reason why this shouldn't work. As we all know a gas is made
up of atoms and these atoms are continuously moving, hence pressure,
temperature etc. etc,
What I am asking is first, is it possible to construct a barrier that
lets atoms through in only one direction? Some sort of nanoscale valve?
I don't think it is possible at the macro scale every scheme I think of
will not work.
If it is possible to construct such a barrier could this barrier be
used to extract work from the systems without any heat sink.
I envisage some sort of barrier which increases the pressure on one
side and decrease it on the other and a turbine working between the
two. Energy would be conserved as the random motion of the particles in
the system as a whole would be decreased.

I can't think of any reason to forbid such as system other than the
fact that it would violate, I believe though correct me if I am wrong,
the second law. It is my contention that the second law comes from
macroscopic systems and thus is not applicable to this system as the
barrier would control the passage of individual atoms.

This problem is annoying me and I look forward to a resolution even if
it is found that what I am saying is absurd.


Here's some background
http://en.wikipedia.org/wiki/Maxwell%27s_Demon

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