I got wondering about the troublesome leaks that have forced NASA to cancel launches of the super rocket Artemis.
Didn't we learn how to build rockets that do NOT leak in the 1960's?
This website...
...has a great article with the answer. Blame the use of Hydrogen:
"Hydrogen is the most abundant element in the universe, but it is also the lightest. It takes 600 sextillion hydrogen atoms to reach the mass of a single gram. Because it is so tiny, hydrogen can squeeze through the smallest of gaps. This is not so great a problem at ambient temperatures and pressures, but at super-chilled temperatures and high pressures, hydrogen easily oozes out of any available opening."
FULL Article is HERE.
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