The S-IVB also ongoing to thrust at a very low level by venting gaseous hydrogen, to help keep propellants settled within their tanks and forestall gaseous cavities from forming in propellant feed lines. This venting also preserved Risk-free pressures as liquid hydrogen boiled off inside the gasoline tank. This https://ambiq-sdk21863.blogtov.com/7095235/detailed-notes-on-apollo-mcu