text: how heavy is 1 cu ft. of air?  does air take up space? what weighs 14.7 lbs? 14.7 lbs refers to the amount of force on a square inch of area at sea level due to air. at 68 degrees farenheit and at sea level pressure (1013mbar), 1 cubic foot of air weighs .0752 pounds. the equation meteorologists use is p = (ro)*r*t where p is pressure in pascals, ro is the density in kg/m^3, r is a constant equal to 287, and t is the temperature in kelvin.