This question cannot be answered sensibly. A cubic foot is a measure of volume, with dimensions [L3]. A pound is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information. It takes only a little mental effort to compare a cubic foot of air and a cubic foot of lead to see that the two will have very different masses.
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To convert cubic feet to pounds, you need to know the density of the material. For example, for water, which has a density of 62.4 lbs per cubic foot, you would multiply 304 cubic feet by 62.4 to get the weight in pounds.
To convert pounds to cubic feet for shipping, you need to know the density of the material being shipped. Divide the weight in pounds by the density to get the volume in cubic feet. For example, to convert 100 pounds of material with a density of 50 lbs/ft³, you would divide 100 by 50, resulting in 2 cubic feet.
The weight of 0.4 cubic feet depends on the density of the material. To convert volume to weight, you need to know the specific density. If we assume an average material density of 100 lbs/cubic foot, then 0.4 cubic feet would weigh 40 lbs.
To convert cubic feet of acetylene to pounds, you need to know the density of acetylene. The density of acetylene is approximately 0.0012 pounds per cubic foot. You can then multiply the cubic feet of acetylene by the density to get the weight in pounds.
The weight of a cubic foot of stainless steel is around 494 pounds.
180 pounds of water would occupy 2.88 cubic feet (180 lbs / 62.5 lbs/ft^3 = 2.88 ft^3).