Other contributors have said "How many pounds are in 5 gallons of paint?" is the same question as "What are the weights in pounds of liquid gallons?" If you believe that these are not asking the same thing and should be answered differently, click here
First, you must know the specific gravity of the liquid then you can calculate the weight by multiplying the specific gravity by 8.34 lbs. 8.34 lbs is the weight of a gallon of water that has a specific gravity of 1.
Pounds is a unit of mass/weight. Gallons is a liquid measure. They do not convert cleanly. The density of the liquid being measured can make a big difference. If the liquid is water, there is 8...
There is not such unit as a "liquid pound" (unlike a liquid ounce, which does exist).
To go from a weight in number of pounds of a liquid to a volume in gallons, you need to know the density of...