## Positional vs. Thermal Motion disorder

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

Viraj B 3A
Posts: 22
Joined: Fri Sep 26, 2014 2:02 pm

### Positional vs. Thermal Motion disorder

What does it mean for a system to be positional disorder dominant? How does that differ from a system that is being dominated by thermal motion disorder? How can we distinguish the two? Thanks!

Niharika Reddy 1D
Posts: 127
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Positional vs. Thermal Motion disorder

I think positional disorder relates to how much space the molecules have to move around. Gas in a larger volume would have more positional disorder than gas in a smaller volume, and molecules in a solid would have less position disorder than those in a liquid, which would have less than those in gas.

Thermal motion disorder is related to temperature, as disorder increases as temperature increases.

I'm not sure, but maybe a system that increases in volume or a reaction that produces more gas molecules or a solid that dissociates would be more positional disorder dominant, and a system that increases in temperature might be more thermal motion disorder dominant.

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