In a diagram of the particles in a liquid, make sure that they are mostly touching but randomly arranged. ... The particle model is the name for the diagrams used to draw solids, liquids and gases.

Caltech scientists have found a fast and efficient way to add up large numbers of Feynman diagrams, the simple drawings ...

All liquids (except helium owing to quantum effects) ... E. & Sciortino, F. Phase diagram of a tetrahedral patchy particle model for different interaction ranges. J. Chem. Phys. 132, 184501 (2010).