"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.
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.
One inch of rain over one square foot is 1/12 cubic foot of water. A cubic foot of water weighs about 62.4 pounds. 1/12 of that is about 5.2 pounds.