RP-1 (refined petroleum) is a highly refined form of kerosene similar to jet fuel, used in the United States as a rocket fuel. RP-1 is typically burned with LOX (liquid oxygen) as the oxidizer. Although considerably less powerful than liquid hydrogen per mass, RP-1 can be stored at room temperature and is far more dense (a given volume of RP-1 is significantly more powerful than a similar volume of LH2) and so is more practical for many uses.
RP-1 is a fuel in the first-stage boosters of the Delta and Atlas rockets. It also powered the first stages of the Titan I, Saturn IB and Saturn V.
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