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If we know an object's volume and the weight density of the material of which it is made, we can calculate its weight. But to determine the object's volume, we must know more than its width and height (or depth). We must also know its length. Most standard two-by-fours are eight feet long, but the type of wood varies. Different woods have different weight densities, and some lumber isn't as dry as it should be. Moisture in the lumber increases its weight density. So, let's assume the 2x4 is eight feet long. A 2x4's actual dimensions are 1.5" x 3.5", so its volume is 1.5 x 3.5 x 96 = 504 cubic inches. Divide that by 123 to get 0.2917 cubic feet. The nearby link shows the weight densities of common lumber. Let's assume it's made of pine, which is pretty common. If we use the high end of the range, pine has a weight density of 34 pounds per cubic foot, so 0.2917 x 34 = 9.9167 pound = 158.7 ounces (4.499 kilograms), more or less, depending on the type of pine (Oregon, Parana, Canadian, Red) and the corresponding density. Density tables can be found at a number of sites such as simetric.co.uk, where various material densities can be found, including woods.

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16y ago

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