Liquid hydrogen is used in large volumes in the space program as a primary rocket fuel for combustion with oxygen or fluorine, and as a propellent for nuclear powered rockets and space vehicles.

• 作为同氧或氟燃烧的主要的火箭燃料，以及作为核弹和宇宙飞船的推进剂，液氢大量用于空间计划。