page_title: Rocket propellant
hierarchical_section_title: Rocket propellant
caption_attribution_description: English: A United Launch Alliance Delta IV-Heavy rocket carrying a National Reconnaissance Office payload launches Aug. 28, 2013, from Space Launch Complex-6 at Vandenberg Air Force Base, Calif. This was the second Delta IV-Heavy launch for Vandenberg AFB, with the first occurring Jan. 20, 2011. The rocket is the largest to ever launch from the West Coast of the United States.
context_page_description: Rocket propellant is the reaction mass of a rocket. This reaction mass is ejected at the highest achievable velocity from a rocket engine to produce thrust. The energy required can either come from the propellants themselves, as with a chemical rocket, or from an external source, as with ion engines.
context_section_description: Rocket propellant is the reaction mass of a rocket. This reaction mass is ejected at the highest achievable velocity from a rocket engine to produce thrust. The energy required can either come from the propellants themselves, as with a chemical rocket, or from an external source, as with ion engines.
caption: A Delta IV Heavy during liftoff. The rocket is entirely fuelled with Liquid Hydrogen and Liquid Oxygen cryogenic propellants.
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