What is Glass? (image) Washington University in St. Louis Caption Glass is a liquid that has lost its ability to flow and so instead of taking the shape of its container can itself serve as a container. Credit Mehran Moghtadai/GNU Free Documentation License Usage Restrictions None 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.