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A yard of concrete is a measure of volume. A square foot is a measure of area. A cubic yard is 27 cubic feet of stuff. (3x3x3)To relate volume to area you must extend the area over a third dimension. One square foot that is one foot deep will equal one cubic foot. (1x1x1)So, a yard of concrete is 27 cubic feet or 3 feet tall 3 feet wide 3 feet deep. concrete wieghs 150lbs per cubic foot 27cubic feet times 150 pounds is 4050 pounds. This is 1 cubic yard of concrete.
none, a hole has nothing in it
How many square yards in a 20x18 feet 3 inches thick
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.
A yard of concrete is a cubic yard and cannot be converted directly to square feet of coverage. You must first determine the depth or thickness that the concrete will be. For instance, since 1 cubic yard equals 27 cubic feet, a 1 foot thick layer of concrete will cover 9 square yards of area. A 4 inch (1/3 foot) thick layer would cover 27 square feet of area.