A thermodynamically reversible change is one that can be reversed by an infinitesimal modification of a variable.
[ reversibility ] < > [ equilibrium ]. Systems at equilibrium can easily undergo reversible change.
In the region of elastic
deformation, strain is proportional to the stress applied to a material and
is reversible:
»
:- (
of shape).
Deceleration is interpreted as {reversal} :- (acceleration.)
Negation, the logical operation on propositions, is interpreted as an instance of {reversal}, both internal and external negation.
Undoing, in the 'Edit' mode of many computer programs, is an instance of »
The inversion of the interval
C (lower pitch) - G (higher pitch) is G (lower pitch) - C (higher pitch).
»:- (lower pitch, higher pitch)
(higher pitch, lower pitch).