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*Hydrogen does not fit well into the normal definitions of octane number. It has a very high RON and a low MON,[12] so that it has low knock resistance in practice,[13] due to its low ignition energy (primarily due to its low dissociation energy) and extremely high flame speed. These traits are highly desirable in rocket engines, but undesirable in Otto-cycle engines. However, as a minor blending component (e.g. in a bi-fuel vehicle), hydrogen raises overall knock resistance. Flame speed is limited by the rest of the component species; hydrogen may reduce knock because of its high thermal conductivity.[perlu rujukan]