The S-IVB also ongoing to thrust at a very low stage by venting gaseous hydrogen, to keep propellants settled of their tanks and stop gaseous cavities from forming in propellant feed lines. This venting also preserved Harmless pressures as liquid hydrogen boiled off inside the gasoline tank. This venting https://hearables87429.blogpayz.com/34335031/detailed-notes-on-apollo-4-plus