You probably think of concrete as heavy. A cubic foot of concrete weighs 143.58 lbs, but a cubic foot of chalk or china weighs the same, and a cubic foot of sand weighs more (156.07 lbs.). A cubic foot of solid porphyry is 159 pounds. A cubic foot of fired clay brick? It weighs 150 lbs., but common red brick only 120 lbs. A cubic foot of Portland cement is only 94 pounds.

How about aluminum? Fairly light, huh? A cubic foot of solid aluminum weighs 168.56 lbs, about 25 pounds more than the cf of concrete. However, if you pulverized the aluminum, a cubic foot would weigh only 47 lbs.

Second aside: With our thoughts often today on gasoline prices, do you think a cubic foot of gas weighs more or less than a cf of water? Gas is heavy on the pocketbook, but lighter than water?EUR??,,????'?????<

Sources: Firefly?EUR??,,????'?????< www.reade.com