Reaction Chamber Gas Air Exchange (IMAGE) Max-Planck-Gesellschaft Caption What is the source of nitrous acid in the atmosphere? Mainz scientists study the exchange of gases between soil samples and the air in this reaction chamber. Credit Su, Max Planck Institute for Chemistry. 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.