Thus, transporting liquid hydrogen requires sophisticated refrigeration technologies such as cryogenic tanker trucks and liquefaction plants.
[2] Mechanochemistry refers to chemical reactions triggered by mechanical forces as opposed to heat, light, or electric potential.
[4] Liquid hydrogen requires such low temperatures that leaks may solidify other air components such as nitrogen and oxygen.
Solid oxygen can mix with liquid hydrogen, forming a mixture that could self-ignite.
[5] ISO Technical Committee 197 is developing standards governing hydrogen applications.