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On 01/17/2012 03:46 PM, Christopher M. Gould wrote:Ah, yes: not accomplished on vertical air masses (as far as I know) ,
mass transport equilibrium .... Here, with an imposed<hypothesis>
gravitational potential, air at the top of a column will be colder than
at the bottom.
Let's explore that idea.
To make it more interesting, set up a copper rod next to the
air column. There will be no mass transport in the copper,
just thermal conductivity, so it will be isothermal.
The rod and the air column have the same temperature at the
bottom, since they are both in contact with the heat bath
at that point.
If they have a different temperature at the top, you can
run a heat engine using the difference. Voilà! Perpetual
motion machine.
</hypothesis>