I learnt quite a bit more, the densification cooling of Oxygen and Methane I knew about, but how much denser does it make it? I did not know so much about Hydr

I learnt quite a bit more, the densification cooling of Oxygen and Methane I knew about, but how much denser does it make it? I did not know so much about Hydrogen requiring two stage cooling, or that there’s ortho and para hydrogen. Or that RP-1 is hydrocarbons with just 12 carbons, and that saturated bonds have to be removed.