At approximately what temperature must liquid hydrogen ($ ext{LH}_2$) be stored to prevent evaporation?
Answer
About $20$ Kelvin ($-253^ ext{ extdegree C}$)
Liquid hydrogen requires storage at about $20$ Kelvin ($-253^ ext{ extdegree C}$), which is significantly colder than the requirements for $ ext{LOX}$ and is referred to as 'deep cryogenic storage.'
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