## 3rd law of thermodynamics

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

HannahBui 2K
Posts: 101
Joined: Wed Sep 18, 2019 12:19 am

### 3rd law of thermodynamics

What do we need to know about the 3rd Law of Thermodynamics? I am having some trouble understanding the concept

705121606
Posts: 68
Joined: Wed Sep 18, 2019 12:17 am

### Re: 3rd law of thermodynamics

i think we just have to know that in a perfect crystalline substance there is no entropy. This can be found using the residual entropy equation: deltaS=kblnw and because it is already perfect the equation would then be delta s= kbln 1 which would be zero. This tells us that in a perfect crystalline substance there is no entropy at absolute zero or 0 kelvin.

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