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From German Hypergol, hypergolisch, from Ancient Greek ὑπέρ (hupér) + ἔργον (érgon, work) + -ol.


  • IPA(key): /hʌɪpəˈɡɒlɪk/


hypergolic (not comparable)

  1. (chemistry, aeronautics, of a reactant, fuel or propellant) That ignites spontaneously on contact with an oxidiser; (of a reaction) characterised by such ignition.
    • 1994, Stephen K. Hall, Chemical Safety in the Laboratory, CRC Press, page 65,
      The chemical reaction range of hypergolic mixtures varies from slow and barely visible to an instantaneous and highly visible explosive force.
    • 2004, Eric A. Hurlbert, Robert J. Moreland, Chapter 11: Propellant Ignition and Flame Propagation, Vigor Yang, Mohammed Habiballah, James Hulka, Michael Popp (editors), Liquid Rocket Thrust Chambers: Aspects of Modeling, Analysis, and Design, AIAA, page 421,
      Hypergolic ignition relies on exothermic low-temperature liquid-vapor chemical reactions to initiate combustion throughout the chamber.
    • 2016, Pasquale M Sforza, Theory of Aerospace Propulsion, 2nd Edition, Elsevier (Butterworth-Heinemann), page 565,
      Although the LF2-LH2 cryogenic combination is hypergolic, the toxicity of the fuel and the products of combustion have made the use of this system impractical. In general, the commonly used hypergolic propellants are considered conventionally storable, that is, they do not need special refrigeration equipment to keep them liquid.

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