2006-10-28 07:01:04 · 3 answers · asked by buzzb4rt 1 in Science & Mathematics ➔ Earth Sciences & Geology
Nitrogen - 78%
Oxygen - 21%
Argon - 1%
These add up to 100%, because I haven't given you the third significant figure. Fourth is carbon dioxide, 0.03%.
2006-10-28 07:03:34 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋
PRESENT COMPOSITION OF THE ATMOSPHERE:
The atmosphere is comprised of gases which are considered to be permanent (gases which remain essentially constant by percent) and gases considered to be variable (gases which have changing concentrations over a finite period of time).
PERMANENT gases in the atmosphere by percent are:
Nitrogen 78.1%
Oxygen 20.9%
(Note that these two permanent gases together comprise 99% of the atmosphere)
Other permanent gases:
Argon 0.9%
Neon 0.002%
Helium 0.0005%
Krypton 0.0001%
Hydrogen 0.00005%
VARIABLE gases in the atmosphere and typical percentage values are:
Water vapor 0 to 4%
Carbon Dioxide0.035%
Methane 0.0002%
Ozone 0.000004%
2006-10-28 15:03:22 · answer #2 · answered by young_friend 5 · 0⤊ 0⤋
It varies with altitude and humidity. The attached links offer some good numbers, depending on how much detail you want.
2006-10-28 14:09:14 · answer #3 · answered by novangelis 7 · 0⤊ 0⤋