text: 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.