Density is the ratio of an item’s weight to its volume typically measured in pounds per cubic foot. American household goods have been getting lighter and lighter for decades, therefore their density has also decreased proportionately. Today, the average density of HHG is between 5-6 pounds per cubic foot; very low compared to other substances. To give some perspective, solid oak has a density of 45 lbs. per cubic ft., water is 63, concrete is 143, and steel is 490.