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The hydrogen used in Climate Impulse is classified as green hydrogen, meaning it is produced using renewable electricity. The process begins with electrolysis, separating water into hydrogen and oxygen. This hydrogen is then liquefied and stored in the aircraft's fuel tanks. Inside the aircraft, the stored hydrogen and oxygen are recombined to generate electricity, which powers the aircraft's propellers.
This system of operation is not entirely new; liquid hydrogen has been successfully used to power rockets. However, what Climate Impulse aims to achieve is transition this technology into practical use in commercial aviation.