In the UK a gallon of water weighs 10 lbs
I am guessing it will be 8 lbs in the US as there is a different definition of the pint and therefore the gallon
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The weight of a gallon can vary depending on its contents, but as a general rule of thumb, 1 gallon of water weighs approximately 8.34 pounds.
There are 128 fluid ounces in 1 gallon.
A 150 lb adult would weigh about 18.75 gallons of water (150 lbs ÷ 8 lbs/gallon).
A 55-gallon drum of water weighs approximately 460 pounds.
one gallon of 85w140 equals 7.53 lb/gallon 120/7.53=15.936 gallons
From personal experience, a 40 lb. bag will fill a five gallon pail heaping and spilling over a bit. So, a five gallon pail will hold approximately 35 pounds of wood pellets flush to the top.