## Residual Entropy

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

Andy Liao 1B
Posts: 52
Joined: Thu Jul 13, 2017 3:00 am

### Residual Entropy

I know that by definition, residual entropy is entropy at T=0K. However, I don't understand how this statement conceptually makes sense. Can someone please explain?

soniatripathy
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

### Re: Residual Entropy

0K is absolute zero at which there would be very little particle motion that contributes to heat. This also means that motion that contributes to thermal and positional disorder would be very low. the residual entropy is the amount of positional disorder that survives at such a low temperature. it is also the difference between the entropy we get from the statistical model and the experimental value (that could be found using something like calorimetry

Chris Lamb 1G
Posts: 58
Joined: Fri Jun 23, 2017 11:39 am

### Re: Residual Entropy

At 0K, there is no movement. The only disorder is resulting from position of the molecules. That is why residual entropy is positional entropy.

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