What is the primary challenge associated with storing Liquid Hydrogen ($ ext{LH2}$) compared to liquid methane?

Answer

It must be stored at an incredibly cold $20 ext{ K}$ ($ ext{-253}^ ext{o} ext{C}$), necessitating heavy insulation.

Liquid hydrogen requires storage at $20 ext{ K}$, which is significantly colder than methane's $111.6 ext{ K}$. This extremely low temperature demands complex and heavy insulation to manage boil-off, creating a structural penalty.

What is the primary challenge associated with storing Liquid Hydrogen ($	ext{LH2}$) compared to liquid methane?
fuelrocketpropellantcombustionMethane