The S-IVB also continued to thrust in a reduced stage by venting gaseous hydrogen, to keep propellants settled inside their tanks and prevent gaseous cavities from forming in propellant feed lines. This venting also taken care of Secure pressures as liquid hydrogen boiled off from the fuel tank. This https://raymondbazxt.thechapblog.com/33116420/considerations-to-know-about-apollo3-blue