_:b1217488 . _:b1217488 . _:b1217488 . _:b1217488 "The mixture of gases (roughly (by molar content/volume: 78% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, trace amounts of other gases, and a variable amount (average around 1%) of water vapor) that surrounds the planet Earth."^^ . _:b1217488 "Wikipedia:Air"^^ .