PhET "Physics Education Technology," University of Colorado - Boulder

The computer simulation does show a simple mathematical based model of the three states of matter as represented by a cluster of atoms or molecules and a simple view of the transition states between the phases of matter: melting, boiling, condensation, freezing. The vibration and movement of the atoms and molecules are not 100% "realistic" or "accurate", but it does convey a good general representation of the states of matter, especially for young students.

https://phet.colorado.edu/sims/html/states-of-matter-basics/latest/state..."Physics Education Technology,"

A interactive learning guide can accompany this simulation.

TITLE Intermolecular forces and states of matter

AUTHORS

Ted Clark (The Ohio State University)

Julia Chamberlain (University of Colorado Boulder)