About 120 lb
Just for reference: 1 cubic foot = 6.25 gallons (imperial), I gallon of water weighs 10 lb, so a cubic foot of water weighs 62.5 pounds. This means the specific gravity of gravel is 120/62.5, or a bit less than 2.
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Knowing that 1 cubic foot is pretty much equal to 100 pounds or 0.05 ton, 1 ton of gravel is around 20 cubic feet.
150 pounds That is 1 cubic foot and concrete weighs 150 pounds per cubic foot
1 cubic foot of iron, at room temperature would weigh approx 2190 newtons.
"http://wiki.answers.com/Q/How_much_crushed_gravel_for_eighteen_square_feet_by_four_inches_deep" 6 cubic feet. With Gravel weighing 95 pounds per cubic foot, you will need approximatly 570 pounds of gravel Four inches is 1/3foot so 18sq.ft x 1/3ft=6cu.ft. You usually buy gravel by the cubic yard which is 3ftx3ftx3ft=27cu.ft so you only are looking at 2/9 cu.yd18sq.ft is only 4ftx4-1/2ft. so is not much area to cover. Weight varies by type of gravel.
1 cubic foot.