That depends on the type material you are referring to. Also, these are two different types of measurements. Gallons is a measure of volume but the other is weight or mass. Please edit your question to include more context or details.
I have no idea,
but a gallon of water weighs 8 pounds
and a gallon of gas about 5
That is a little hard to answer, but I think a good guess might be about 10 pounds. It depends on the exact composition of the potato salad.
1.73 kg per liter = 14.4 pounds/gallon (US)
A gallon weights about 8.4 pounds, so 11 x 8.4 = 92.4 pounds
It depends on what you have 12.5 gallons of. Water weighs 8.34 pounds per gallon. so 12.5 gallons x 8.34 pounds per gallon =104.25 pounrds. Gasoline weighs only about 6.2 pounds per gallon. 12.5 gallons x 6.2 pounds per gallon = 77.5 pounds.
7.5 pounds per US gallon
For plain water about 41.7 pounds at 8.345lbs per gallon.
9.4 pounds per gallon
4.24 pounds per gallon as per gas facts
15 pounds per gallon
1.73 kg per liter = 14.4 pounds/gallon (US)
1 gallon of gasoline equals 5.8 to 6.5 lbs.
99 pounds
80 gallons of water weighs about 668 pounds (about 8.35 pounds per gallon).
depends soley on the desity of the liquid in the gallon.
The solution itself weighs 11.68 pounds per gallon and contains 1.17 pounds of nitrogen per gallon and 3.97 pounds of phosphate (P2O5) per gallon.
8.586
5
Approximately 6.073 pounds per US gallon.