Side by side, butt-to-butt, two cylinders of air, of equal volume and
equal temperature, but different histories. They are separated by a
frictionless sliding divider which is now pegged.  Before compression or
heating, both started with air at 10 degrees C, and after compression or
heating, both arrive at 20 degrees C. The left one has arrived at its
present temperature and volume by being compressed, the right-hand one
by having its volume set to the same value as the left and then having
contents  heated.  All compartments insulated, all manipulations
quasi-static.  Now, remove the peg, allowing the partition between the two
parts to slide, one way or the other.  Which way would it slide and why.
What would your explanation be?  Please don't read others' answers until
you have submitted your own.
-- 
Nicholas S. Thompson
Emeritus Professor of Psychology and Ethology
Clark University
[email protected]
https://wordpress.clarku.edu/nthompson
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