Assertion: gunpowder's oxidizer | /r/HasProperty | solid fuel
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text: The stored propellant can be a simple pressurized gas or a single liquid fuel that disassociates in the presence of a catalyst (monopropellant), two liquids that spontaneously react on contact (hypergolic propellants), two liquids that must be ignited to react, (like kerosene (RP1) and liquid oxygen, used in most liquid-propellant rockets) a solid combination of fuel with oxidizer (solid fuel), or solid fuel with liquid or gaseous oxidizer (hybrid propellant system).