Two Part System

Extensive Quantities

• $U=U_1+U_2=-\frac{\partial }{\partial \beta }\ln Z={\tau }^2\frac{\partial y}{\partial \tau }\ln Z$
  • $Z$ is the [Partition Function]
• $V=V_1+V_2$
• $N=N_1+N_2$
• $\sigma ={\sigma }_1+{\sigma }_2$

Intensive Quantities

• $\Omega ={\Omega }_1{\Omega }_2$