Video: H₂ bubble formation (VIDEO) Forschungszentrum Juelich This video is under embargo. Please login to access this video. Caption Experiment: Activation of H₂ bubble formation in catalyst pellets by light pressing with a metal rod Credit HI ERN / Thomas Solymosi Usage Restrictions Editorial use permitted with credit to source. License Original 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.