On Wed, Dec 4, 2013 at 12:03 AM, meekerdb <meeke...@verizon.net> wrote:

> But if the processes are reversible (and they can be) then there is no
> entropy increase and no heat.

But if it's reversible then there is no irreversible change in information
either (such as what you'd get if you erased information) and Landauer's
principle still holds true. So if you make a irreversible change in
information you make a change in a physical quantity (like heat), and if
you make a irreversible change in a physical system (like rotating
something in 3 dimensions) you change the information it encodes. What more
would you need to be able to say that information is physical?

  John K Clark

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