You cannot do that since cubic yard is volume and square foot is area. You need to know the thickness
You don't, square feet are a measure of area and cubic feet are a measure of volume.
You simply can't convert square units to cubic units.
You can't convert that. You can convert linear units to linear units, square units to square units, or cubic units to cubic units.
You don't. You either A) convert 18 cubic inches into cubic feet, or B) convert 18 square inches into square feet. A... there are 1728 cubic inches in a cubic foot, so 18 cu in would be 0.00104 cu ft. B... there are 144 square inches in a square foot, so 18 square inches would be 0.125 sq ft.
Multiply by 144, since there are 144 square inches in a square foot (12x12).
You don't, square feet are a measure of area and cubic feet are a measure of volume.
You simply can't convert square units to cubic units.
mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.mph is a unit of speed; pounds per square foot is a unit of pressure. You don't convert that.
Pounds per square foot x 0.006944 equals psi
You can't convert that. You can convert linear units to linear units, square units to square units, or cubic units to cubic units.
Those are incompatible units. Pounds per square foot is pressure. Pounds per cubic foot is density. It is like converting gallons to inches.
Typical window glass weighs 156 pounds per cubic foot. For comparison, a cubic foot of aluminum weighs about 168 pounds, and a cubic foot of oak is around 50 pounds.
Trying to convert dollars per square foot into dollars per cubic yard is like trying to convert apples into oranges. A square foot is a measurement of area, whereas a cubic yard is a measurement of volume.
You don't. You either A) convert 18 cubic inches into cubic feet, or B) convert 18 square inches into square feet. A... there are 1728 cubic inches in a cubic foot, so 18 cu in would be 0.00104 cu ft. B... there are 144 square inches in a square foot, so 18 square inches would be 0.125 sq ft.
1 kg/cubic metre = 77.853 pounds/ cubic foot.
Multiply by 144, since there are 144 square inches in a square foot (12x12).
Pounds per cubic foot x 16.0184634 = kg/m3