Why the Constant Volume Rule Works (VIDEO) Washington University in St. Louis This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption By adding a constant volume before they divide, randomly sized bacteria quickly approach a common size. In this example, a cell that is bigger than average arrives at the common size in only a few replications. Credit Jun Lab Usage Restrictions Please credit the lab 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.