To what temperature does liquid hydrogen boil, as mentioned in the text?
Answer
About $-253^ ext{ extdegree} ext{C}$ ($-423^ ext{ extdegree} ext{F}$)
Liquid hydrogen boils at about $-253^ ext{ extdegree} ext{C}$ ($-423^ ext{ extdegree} ext{F}$), which is significantly colder than liquid oxygen.
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