The CLOUD Chamber at CERN (IMAGE) University of Helsinki Caption With a 3-metre diameter, the CLOUD chamber at CERN is one of the largest experimental chambers in use globally. Credit H. Manninen 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.