What is the volume of air that weighs one ounce?

This question is difficult to answer because the density of air varies so widely and is dependent on so many things. The density of air changes with temperature and pressure and the amount of moisture it contains. So, let's assume that you have dry air at zero degrees Celsius and one atmosphere. Also, you didn't state the units you wish your answer to be in. Many air-density tables state the density of dry air to be 1.25 kg/m3. That's equal to 0.000 722 546 ounce/cubic inch. If we find the reciprocal of that value -- that's 1 / 0.000 722 546 -- we get 1384 cubic inches per ounce, which is equal to 0.801 cubic feet per ounce. Note that the ounce used above is a dry ounce, not a liquid ounce.