I will assume that you are talking about a 42 gallon barrel of pure water at 60 F.
m = ( d ) ( V )
m = ( 8.338 lbm / gal ) ( 42 gal ) = 350.2 lbm <--------------
That would all depend on the barrels height.
150 milliliters of pure water weigh 150 grams.
In general a fluid ounce of water will be an ounce of weight. A pint of water is 16 ounces which would be one pound.
Assuming you mean "212 degrees Fahrenheit and at sea level". 15.991 ounces, or almost exactly one pound.
A barrel of fresh water is 31.5 gallons in most states.
A standard barrel (Drum) is 55 gallons, therefore if the barrel is full of water it would weigh 440 pounds. An oil barrel is smaller and holds only 40 gallons and weigh apx 280 lbs as petroleum is lighter than water
A standard barrel of cement weighs around 380-400 pounds.
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)
That would all depend on the barrels height.
One once
One gallon of water weighs about 8.34 pounds, so one hundred gallons of water would weigh approximately 834 pounds.
One cubic centimeter of water would fit into that cup, and it would weigh 1 gram.
I litre of water weighs one kilogram on year and would weigh 0.1 kilograms.
about 4kg
One liter of water weighs one kilogram, so 1000 liters of water would weigh 1000 kilograms, which is equivalent to 1 metric ton.
About 8.35 pounds.
150 milliliters of pure water weigh 150 grams.