The S-IVB also continued to thrust in a minimal amount by venting gaseous hydrogen, to help keep propellants settled of their tanks and prevent gaseous cavities from forming in propellant feed traces. This venting also maintained Risk-free pressures as liquid hydrogen boiled off in the gas tank. This venting https://ambiq.com/news/smartaly-and-ambiq-develop-energy-efficient-ai-enable-medical-grade-ecg-monitor/