S=0

[Dina Geotas 4A]

When is entropy equal to 0?

[Courtney Quan 1C]

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=k_bln(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.

[Samantha Man 1L]

A system at equilibrium has no tendency to change in either the forward or reverse direction so it would have an entropy of 0.

[Phan Tran 1K]

I think it's deltaS that can be zero. Not too sure if S itself can be zero, maybe at the hypothetical subzero?

[Elizabeth Gallmeister 1A]

deltaS is also zero when the start conditions and end conditions of a process are the same, because entropy is a state function.

[LaurenJuul_1B]

delta S is zero when there is no change in the disorder of the system between the initial and final values

S itself I think can be zero if you have a perfect system, but I'm not 100%

[Jason Ye 2I]

Entropy is equal to zero in a perfect crystal at T= 0K

[Olivia L 4E]

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.

[EllaBerry]

S is equal to zero in a perfect crystal when the temperature is 0K.

[chrisavalos-2L]

S is equal to zero when there is temperature is at zero Kelvin and when there is no disorder, in the instance of a perfect crystal.

[404982241]

entropy is a state function therefore if the initial entropy is equal to the final entropy then the delta s is 0

[Ricardo Martin 1J]

S=0 in a perfect crystal (T= 0 Kelvin)

[Jacqueline Duong 1H]

S is equal to zero when there is no change in the state of entropy and temperature reaches 0 K