ConstReadonly100LL: FuelDensity100 low-lead avgas, the standard piston-aircraft fuel in the US.
ReadonlyJet A: FuelDensityJet A, the primary turbine fuel used in North America.
ReadonlyJet A-1: FuelDensityJet A-1, the international turbine fuel (lower freeze point than Jet A).
ReadonlyJet B: FuelDensityJet B, a wide-cut turbine fuel used in very cold climates.
Nominal fuel densities for common aviation fuels, referenced at 15 degrees C per industry convention. Real-world fuel density varies roughly 0.7% per 10 degrees C temperature change and also between refinery batches, so pilots performing precise weight-and-balance calculations should prefer the field-measured density printed on the fuel ticket. These constants are appropriate defaults for planning and estimation.