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p_1 = p_2  \end{equation}  Q: This defines the p(T) equation of state, however, how do you calculate chemical potential in molecular simulation -- theoretically?  While this gives a very clear picture on how the bulk (infinite) phases are related, that is not enough to describe how things work at finite scale and at an atomistic level. For example, in a liquid-solid phase transition, it is necessary to under-cool the system before triggering the phase transition. The system can be in a meta-stable state. Trapped in a free energy local minimum.