Does entropy in a closed system always increase OR remain constant (

AI Thread Summary
In a closed system, entropy tends to increase until it reaches equilibrium, at which point it remains constant. The argument presented states that in an isolated system with no energy exchange, the availability of energy decreases, leading to increased entropy. However, once the system reaches equilibrium, macroscopic quantities such as energy, volume, and the number of particles stabilize, resulting in constant entropy. The discussion emphasizes that while entropy increases during the transition to equilibrium, it does not change once that state is achieved. Thus, entropy in a closed system always increases until equilibrium is reached, after which it remains constant.
srfriggen
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Does entropy in a closed system always increase OR remain constant ( in equilibrium ).

I have a friend arguing it is ALWAYS increasing.

His latest argument was, "if no energy enters or leaves an isolated system, the availability of the remaining energy decreases."
 
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Once the closed system reaches its final equilibrium state , the entropy remains constant. The entropy of a system is a function of several macroscopic quantitates ( Energy, Volume, Number of particles ). Once all this remains constant ( Like a gas in a box which is uniformally distributed in it) how could the entropy change?
 
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