## Residual Entropy

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

Gurvardaan Bal1L
Posts: 54
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 2 times

### Residual Entropy

What exactly is residual entropy and how is it related to the Boltzmann equation?

Sabrina Dunbar 1I
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

### Re: Residual Entropy

Residual/positional entropy is the entropy calculated at a constant temperature, independent of the enthalpy value of the system. The other entropy, thermal entropy, incorporates the ∆H value because there is a change in temperature of the system. Boltzmann's equation does not account for temperature, so that is why it is the best to calculate S when T is a constant value with no bearing on the entropy when calculated using only the kB constant and the degeneracy.

Return to “Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy”

### Who is online

Users browsing this forum: No registered users and 1 guest