Mechanical Reversibility? (vs Thermodynamics)

AI Thread Summary
The discussion centers around the concepts of thermodynamical irreversibility and mechanical reversibility in the context of the second law of thermodynamics. The irreversible nature of thermodynamics is highlighted, particularly the flow of thermal energy from hot to cold and the increase of entropy, which leads to a decrease in organization. The term "Mechanical Reversibility" is less clear, with confusion arising from its absence in common resources. The mention of perpetual motion machines, specifically those of the second kind that violate thermodynamic laws by extracting heat, is noted as a key focus in the provided handouts. Suggestions for further exploration include researching concepts like Maxwell's demon and ratchet mechanisms to better understand the relationship between mechanical reversibility and thermodynamic principles.
Batman
I'm a bit confused with this topic we're supposed to be writing a paper on:
"Thermodynamical Irreversibility VS Mechanical Reversibility (Microscopic Nature of the 2nd Law of Thermodynamics)"

I think I know the concept of the irreversible nature of thermodynamics...such as the flow of thermal energy from hot to cold until equillibrium... entropy, and the nature of things to go from organization to lesser degrees of organization. But nowhere can I find the term "Mechanical Reversibility" and I don't really know what he means by it.

He gave us a couple of handouts that were supposed to help us. They both mentioned Perpetual Motion Machines... the main focus seemed to be Perpetual Motion Machines of the 2nd kind... that is, the kind that can extract heat from objects, against the laws of thermodynamics. Nonetheless, I can't seem to connect "Mechanical Reversibility" to any of this, as can't even find an example of it =(

Any ideas? Thanks =)
 
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In Google, type in one or more of the following keywords: "maxwell's demon", ratchet, irreversibility. That ought to get you started.
 

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