# At the vicinity of equilibrium (thermo)

1. Sep 5, 2011

### Proust

Hello everyone,

Below is one paragraphe from my thermo textbook:

Equilibrium for Ai but not for T (XiA = XiB but, for example : TA > TB). Thus, for U and S, we have a gap in relation to the equilibrium : UA = UAeq + $\delta$UA,UB = UBeq + $\delta$UB

Ai is state variables such as V,l, ect. T is temperature.

I don't quite understand why there is not a second situation where Ai is the same but T is different? Why it's not mentioned here?

Thanks a lot.