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An entropy of zero indicates there is no disorder. An example of this would be in a perfectly ordered material. If a system can only be prepared one way (W=1), using S=kbln(W), we have S=0, which indicates that the system could be a perfect crystal. This leads us to the third law of thermodynamics, which states that as temperature approaches absolute zero, entropy (S) also approaches zero.
Jason Ye 2I wrote:Entropy is equal to zero in a perfect crystal at T= 0K
This is for residual entropy (3rd Law of Thermodynamics) but if you are asking for when delta S = 0, that's entirely different and occurs when the system is reversible and returns to its original state.
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