If you filled a British Beer Barrel with water, it would weigh 163kg, or 359lb.
If you have a barrel that you want to know the volume of, then we need to know the height, the radius of the widest part, and the raduis of the top.
For other barrel sizes, look at en.wikipedia.org/wiki/Barrel_(unit)
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If the mass of the barrel is 40 kilograms and the barrel is presently on earth, then it weighs 392 newtons (88.2 pounds). What you do with it, what dizzying gyrations you subject it to, or what other objects happen to be nearby, have no effect on its weight.
i gallon worth of pounds
there are 0.0022046226 pounds in one gram or about 2 thousandths of a pound
one
One kilogram is about 2.2 pounds. One pound is about 0.454 kg.