ArticleOxygenation Human beings require air to breathe and sustain life. The air we breathe is composed of approximately 78% nitrogen, 21% oxygen, 0.93% argon, 0.039% carbon dioxide, and 0.031% other gasses. Although oxygenAlready a member? Log InWritten by Christopher WoodYou'll Also Like Article MEMBERS ONLY Olive Oil Aeration Olive oil and beer: Two great things that go great together? A new technique that’s gaining respect among professional brewers may pave the way to preventing oxidation down the road. Article FREE Aerating Wort Techniques Your chilled wort needs oxygen to keep the yeast healthy — here’s how to deliver it.