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Yes, there are situations in which the condition of a system can change without suffering an increase in entropy. In order for this to occur, the system must be initially in a state of thermodynamic equilibrium. It then can, in principle, undergo spontaneous changes to other states which have the same entropy. (Note that I have added a constraint to your question which, I expect, you failed to mention. If not, then of course any reversible adiabatic process carried out an the system will be isentropic.)
An simple instance of such a change which might be observable would be in a system of solid crystals of a pure substance in contact with a saturated solution of the same material. The configuration of the crystals will change over time - spontaneously - without incurring a ticket for violation of the Second Law.
Leigh
On 14 Mar 2010, at 09:00, phys-l-request@carnot.physics.buffalo.edu wrote:
Is there a situation where the condition of a body or system experiences a
change without an increase in entropy -Assuming you are going to count any
changes in the surroundings as well? If so, what would it be?
-Tony
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