Hydrogen Gas
Hydrogen gas is a colorless, odorless, and highly flammable gas that is the lightest and most abundant element in the universe. In space and astronautical engineering, hydrogen gas is used as a rocket propellant due to its high specific impulse and low molecular weight. It is also used as a coolant for space vehicles and equipment, as well as a fuel for fuel cells that generate electricity for spacecraft. Hydrogen gas can be produced through various methods, including electrolysis of water, steam methane reforming, and coal gasification. However, its production and storage require careful handling due to its explosive nature and low ignition energy.
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