Standard weights

Values used in weight and balance calculations if specific weight for an item is unknown. The following are examples: • Aviation gasoline 6 pounds per gallon • Crew and passengers 170 pounds per person • Lubricating oil 7.5 pounds per gallon • Turbine fuel 6.7 pounds per gallon • Water 8.35 pounds per gallon

Aviation Maintenance Technician Handbook — General, p. G-10

Also defined in 1 more source

Weights established for numerous items involved in weight and balance computations. These weights should not be used if actual weights are available.

Pilot's Handbook of Aeronautical Knowledge, p. G-28