So, I am getting ready to rack into my secondary fermenter when it dawned on me, could you purge the air from a carboy with dry ice. I used the ideal gas law PV=nRT (hello high school chemistry) to calculate that I would need 1.23032 oz or 34.87901 g of dry ice to fill my five gallon carboy with co2. ( I live at sea level and my house stays at a pretty constant 64, you can check my math) I am more curious about people's thoughts like "you're wasting time/money" or "absolutely!" I do the keg, and don't plan to any time soon so this is just an idea I am entertaining to limit oxidation. What's your thoughts?