Abstract Model (IMAGE) U.S. National Science Foundation Caption In this abstract model for matter, atoms are replaced by non-overlapping disks, a technique useful for understanding matter phase transitions (for example, the melting of ice). The model reflects a critical point of the system, a configuration through which the disks must pass as they transition from one set of configurations to another. Credit College of Engineering, University of California, Davis Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.