## 3rd law

Boltzmann Equation for Entropy: $S = k_{B} \ln W$

Kaylee Clarke 1G
Posts: 103
Joined: Fri Aug 30, 2019 12:15 am

### 3rd law

what exactly is the third law of thermodynamics ?

Ryan_K_1K
Posts: 51
Joined: Wed Nov 14, 2018 12:18 am

### Re: 3rd law

"The entropy of a system approaches a constant value as its temperature approaches absolute zero."

eduardomorales5
Posts: 77
Joined: Fri Aug 30, 2019 12:15 am

### Re: 3rd law

As temperature reaches zero, the entropy of the system reaches a constant value that reflects the degeneracy of the ground state.

Tauhid Islam- 1H
Posts: 64
Joined: Fri Aug 02, 2019 12:15 am

### Re: 3rd law

The entropy of a system or the disorder of the system has a value at it's ground state that is representative of the degeneracy of the system at absolute zero or when T=0K. This was made under the assumption that at T=0K, all modes of motion stop meaning there is no vibrational, transnational or rotational motion and that would happen in a hypothetical pure, perfectly crystalline substance where no entropy or disorder exists, but instead the system is at perfect order. In the observabale universe, that is not necessarily the case which is why we get values of entropy at T=0K.

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