Ammonia

Ammonia is a colorless gas with a pungent odor that is commonly used as a propellant and coolant in space and astronautical engineering. It is also used as a cleaning agent for spacecraft surfaces and instruments. Ammonia is highly soluble in water and can be easily stored and transported in liquid form. In addition to its practical applications, ammonia has also been studied as a potential fuel for rocket propulsion systems due to its high energy content and ability to be easily synthesized from common elements. However, its use as a rocket fuel is limited by its low density and corrosive properties.
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