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The atmosphere contains about 78% nitrogen gas, 21% oxygen, less than 1% argon, and a number of trace gases including 0.04% carbon dioxide. The percentage of water vapor varies, with as much as 1% by weight at the surface, and an average of 0.4% for the atmosphere as a whole. A cubic meter of air at the surface can hold up to 30 grams (1/6 fluid ounce) of water.

The atmosphere includes a layer of ozone (O3) within the stratosphere, and an ionized layer of rarefied gases at high altitudes.

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7y ago

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