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1 cubic inch.1 cubic inch.1 cubic inch.1 cubic inch.
Here is my take: 1 gallon of water equals 231 cubic inches 1 square foot, 1 inch tall equals 144 cubic inches (12"x12"X1") 1 square foot needs 0.624 gallons to equal 1 inch of cover (144 cubic inched divided by 231 cubic inches) 16 square feet would require 9.975 gallons of water to be covered 1 inch deep. (16*0.624) **Runsky**
The volume of a cylinder is the product of the area of the base multiplied by the height. A washer is a portion of cylinder, and if the cylinder specified by the problem had no hole, its volume would be pi X (1/2)2 X 1/8 = pi/32 = about 0.09817 cubic inches. The volume of the actual washer is this value minus the volume of the hole, which is pi X (1/4)2 X 1/8 = pi/128 = about 0.024554 cubic inches. Therefore, the volume of the washer is about 0.09817 - 0.024554 = about 0.0736 cubic inches.
1 cubic metre is 1,000,000 cubic centimeters. Only 1 cubic centimeter of pure water weighs 1 gram. 1 cubic meter of water weighs 1,000,000 grams, that is 1,000 kilograms or 1 tonne.
Try it out. A cube with four-inch sides has a volume of 64 cubic inches. A cube with two-inch sides has a volume of 8 cubic inches. That's eight times less.