What is the percentage of air?

Answer 1

At Sea Level and Standard Temperature and Pressure (STP), average air samples usually contain the following 16 gasses: 78.1% Nitrogen (N2), 21.02% Oxygen (O2), 1 - 5% Water Vapor (H2O), 0.092% Argon (Ar), 0.0314% Carbon Dioxide (CO2), 0.00183% Neon (Ne), 0.00024% Methane (CH4), 0.000524% Helium (He), 0.000114% Krypton (Kr), 0.000047% Hydrogen (H2), 0.0000079% Xenon (Xe), 0.000007% Ozone (O3), 0.000002% Nitrogen Dioxide (NO2), 0.0000011% Iodine (I2), 0.00000021% Carbon Monoxide (CO), 0 - 0.0000006% Ammonia (NH3).

Answer 2

The principal constituents of the atmosphere of Earth are nitrogen (78 percent) and oxygen (21 percent). The atmospheric gases in the remaining 1 percent are argon (0.9 percent), carbon dioxide (0.03 percent), varying amounts of water vapor, and trace amounts of hydrogen, ozone, methane, carbon monoxide, helium, neon, krypton, and xenon.

Answer 3

Chemical % by volume

Nitrogen (N2) 78.08

Oxygen (O2) 20.95

Argon (Ar) 0.93

Carbon Dioxide (CO2) 0.033

Other trace elements 0.007

Source is www.scifun.org

Answer 4

78% Oxygen.

21% Nitrogen.

1% Other Noble Gases (e.g. Neon, Argon)

Answer 5

78% nitrogen 20% oxygen 1% argon <0.1% noble gases roughly

Answer 6

Air components: nitrogen-78,074 %, oxygen-20,946 %, argon-0,934 %, carbon dioxide-0,39445 %, neon-0,001818 %, etc.

Answer 7

The atmosphere is composed of approximately 78% nitrogen, 21% oxygen, and trace amounts of other gases such as argon, carbon dioxide, and neon.