Editing Statistical mechanics (section)

==== Other ====
* For rarefied non-ideal gases, approaches such as the [[cluster expansion]] use [[perturbation theory]] to include the effect of weak interactions, leading to a [[virial expansion]].<ref name="balescu" />
* For dense fluids, another approximate approach is based on reduced distribution functions, in particular the [[radial distribution function]].<ref name="balescu"/>
* [[Molecular dynamics]] computer simulations can be used to calculate [[microcanonical ensemble]] averages, in ergodic systems. With the inclusion of a connection to a stochastic heat bath, they can also model canonical and grand canonical conditions.
* Mixed methods involving non-equilibrium statistical mechanical results (see below) may be useful.