The S-IVB also continued to thrust at a low amount by venting gaseous hydrogen, to keep propellants settled inside their tanks and prevent gaseous cavities from forming in propellant feed traces. This venting also managed Protected pressures as liquid hydrogen boiled off during the fuel tank. This venting thrust https://ambiq.com/news/ambiq-apollo510-named-iot-semiconductor-solution-of-the-year-2025/