Air

From Teflpedia

Air is a mixture of gases that form Earth's atmosphere.

The composition of air is 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Variable amounts of water vapour are also present.

Sound consists of miniscule changes in air pressure; therefore air is critical to speaking. Air is also critical to breathing.