The S-IVB also continued to thrust in a reduced stage by venting gaseous hydrogen, to keep propellants settled of their tanks and prevent gaseous cavities from forming in propellant feed lines. This venting also maintained safe pressures as liquid hydrogen boiled off while in the fuel tank. This venting https://travisnnkig.blog-eye.com/34050966/a-simple-key-for-apollo4-blue-plus-unveiled