what is the exact composition of gases in the air?

Answer 1

Nitrogen 78.08
Oxygen 20.95
Argon 0.93
Carbon Dioxide 0.03
Neon 0.0018
Helium 0.0005
Krypton 0.0001
Xenon 0.00001

Answer 2

The atmospheric composition on Earth is largely governed by the by-products of the very life that it sustains. Earth's atmosphere consists principally of a roughly 78:20 ratio of nitrogen and oxygen, plus substantial water vapor (a gas), with a minor (but increasing) proportion of carbon dioxide. There are traces of hydrogen, and of argon, helium and other "noble" gases (and of volatile pollutants). Exact measurements are difficult, except for particular locales at a particular time.

Answer 3

Scuba tank gas is a mixture of compressed nitrogen ~79% Nitrogen and 21% Oxygen. Similar to air that we are breathing. Other mix like nitrox, only changes the % content of Oxygen ranging from 21% to 40% depending on type of type you will be doing. Of course there are advance trix mix of Helium, Oxygen and nitrogen to go deeper and longer dives. But this are specialized mix and for Technical diving only.

Answer 4

Depends on your locallity. If you are at a higher location, the O2 will be less. For a real, total brakdown, in your area, call an Airco plant or similar industrial Oxygen/nitrogen/argon plant. For the most part it is 20% O2 and 80% N2. The other stuff will be about 0.5%. About 80% of that will be argon.

Answer 5

About 19% oxygen, 80% nitrogen and 1% trace gases of other kinds.

Answer 6

78% nitrogen 21% oxygen 1% carbon dioxide, nobel gases, and other trivial components of our atmosphere.

Answer 7

70 percent nitrogen, some odd percent of air and other wierd gasses in the universe

Answer 8

"Nitrogen (N2) 780,840 ppmv (78.084%)
Oxygen (O2) 209,460 ppmv (20.946%)
Water vapor (H2O) typically 1% to 4%(highly variable)
Argon (Ar) 9,340 ppmv (0.9340%)
Carbon dioxide (CO2) 383 ppmv (0.0383%)
Neon (Ne) 18.18 ppmv
Helium (He) 5.24 ppmv
Methane (CH4) 1.745 ppmv
Krypton (Kr) 1.14 ppmv
Hydrogen (H2) 0.55 ppmv
Not included in above dry atmosphere:
Water vapor (H2O) typically 1% to 4%(highly variable)
nitrous oxide 0.5 ppmv
xenon 0.09 ppmv
ozone 0.0 to 0.07 ppmv
nitrogen dioxide 0.02 ppmv
iodine 0.01 ppmv
carbon monoxide trace
ammonia trace"

These are approximate, and vary with temperature (time of day and year), pressure, locale, and altitude, but they're reasonably good numbers to work with.

Answer 9

http://www.rdrop.com/users/tedpet/air.htm