# Pressure equation

Revision as of 13:21, 28 June 2007 by Carl McBride (talk | contribs)

For particles acting through two-body central forces alone one may use the thermodynamic relation

Using this relation, along with the Helmholtz energy function and the canonical partition function, one
arrives at the so-called
**pressure equation** (also known as the **virial equation**):

where ,
is a *central* potential and is the pair distribution function.