ABSTRACT
Gases and Gravity Air is made mainly of nitrogen and oxygen with small amounts of other gases. The weather, winds, and air currents keep the gases mixed up together. The gases in dry air are 78 percent nitrogen, 21 percent oxygen, and 0.9 percent argon. The remaining 0.1 percent is a mix of carbon dioxide, neon, helium, methane, krypton, hydrogen, and all other gases. The atmosphere also contains varying amounts of water vapor.
