Two options for equilibration (IMAGE) ETH Zurich Department of Physics Caption Schematic of the two options how the atoms can reach thermal equilibrium starting from two reservoirs at different temperature. Credit S. Häusler, ETH Zurich 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.