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At 11:47 11/25/99 -0700, Jim Green wrote:
>///my question is whether there is _any_ example of a macroscopic
>reversible process other than the ideal piston in a cylinder.
This is another way of asking if there is an 100% efficient machine.
A question that came up a few weeks ago. Steel on ice or ptfe
and ball bearing races come to mind, then fluid and air bearings.
But the celestial spheres seemed almost dissipationless - at least
on human timescales.
A gas tight piston in a smooth cylinder would
come last, I suppose, on any rational list!