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How much fuel in Imperial gallons exist in the fuel tanks of a helicopter, if its fuel weighs 855 pounds and the Specific gravity of the fuel is 0.80?
  • A
    106.9 IG
  • B
    387 IG
  • C
    127.6 IG
  • D
    85.5 IG

A relationship exists between litres and kilograms:

  • 1 litre of water weighs, 1 kilogram.

A similar relationship exists between pounds and imperial gallons (IG):

  • 1 IG of water, weighs 10 pounds.

To convert from volumes to mass or mass to volumes, you need the Specific Gravity of the fuel:

  • The Specific Gravity (SG) shows the relationship between litres and kilograms or between pounds and imperial gallons.

Specific Gravity 0.80 means that a volume of fuel weighs 80% of the equivalent volume of water.

Thus, 855 pounds of fuel has a fuel volume of: 855 lb / 10 / 0.8 = 106.9 lG.


NOTES:
1. Fuel volume is measured in: Imperial Gallons (IG), US Gallons (USG) or litres (l or lt).
2. Fuel mass is measured in:, tonnes (t or ton), kilograms (kg) or pounds (lb).

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