71400 cubic inches of water weighs approx 11466 Newtons.
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a cubic ton
1 US gallon of water weighs 8.33 pounds at 60 degrees F. There are 231 cubic inches of water per gallon, so 8.33 pounds divided by 231 = .03606--> pounds per cubic inch.
2.5 cubic feet of water weighs about: 156 pounds.
2.25 cubic feet of water weighs about 140 pounds.
lead density is 0.41 pounds/cubic inch 1.68 x 0.41 = 0.688 pounds