"Foot-lbs" is a unit of energy, whereas "horsepower" is a unit of power,
which is the same as the rate of using energy.
1 horsepower = 550 foot-pounds per second
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150 pounds That is 1 cubic foot and concrete weighs 150 pounds per cubic foot
One foot of water is merely the depth. Without the surface area, it's impossible to tell how many pounds it gives.
One square foot of water that is 1 inch deep weighs approximately 0.578 pounds. This is calculated based on the fact that 1 cubic foot of water weighs about 62.4 pounds, and since there are 12 inches in a foot, 1 inch of water in a square foot amounts to 1/12 of a cubic foot. Thus, the weight is 62.4 pounds divided by 12, which equals around 5.2 pounds per inch, and for 1 square foot, it totals to approximately 0.578 pounds.
Depending on type of compost, density and moisture content 1 cubic foot of compost will weigh about 10 to 11 pounds.
ATM is the abbreviation for atmosphere's, which is a measurement of pressure. 1 ATM = 14.696 PSI 30 ATM = 440.88 PSI (440.88 pounds)/1 square inch = (40.88 pounds)/(1/144)square feet 63486.72 pounds per square foot. So 30 atmospheres is equal approximately to 63486.72 pounds per square foot.