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When used as a rocket booster, it is filled with 66 Ibs. of water heated electrically to 504° F. The water cannot boil because it is confined, but its pressure rises to 50 atmospheres (735 Ibs.

While prototypes of water-powered rocket thrusters and engines have been developed before, and a few have succeeded in launching CubeSats, water has not yet been used as a propellant on a large scale.