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For other uses, see Air (disambiguation).

Air is a name for the mixture of gases present in the Earth's atmosphere. Compressed air is often used in scuba diving as a shallow water breathing gas and to inflate buoyancy devices. Compressed air is also used as the means of transmission of energy to pneumatic tools.

Composition of air

By volume, dry air is about:

• 78.084% Nitrogen (N₂)
• 20.947% Oxygen (O₂)
• 0.934% Argon (Ar)
• 0.033% Carbon Dioxide (CO₂)

With trace amounts of:

• Neon (Ne)
• Helium (He)
• Krypton (Kr)
• Sulfur dioxide (SO₂)
• Methane (CH₄)
• Hydrogen (H₂)
• Nitrous Oxide (N₂O)
• Xenon (Xe)
• Ozone (O₃)
• Nitrogen dioxide (NO₂)
• Iodine (I₂)
• Carbon monoxide (CO)
• Ammonia (NH₃)

The amount of water vapor in the air varies considerably depending on weather, climate, and altitude. See Humidity.

The molecular mass of air is approximately 28.96443 g/mole (molecular weight of standard air - CRC, 1983).

The density of air is about approximately 0.6113 kgm^-3

Average pressure of air is approximately 101.325 kPa

See also

• Air glow
• Density of air
• Air (band)
• AIR (game)

External link

• Composition of Air
• NASA: Air Properties

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