Oxygen
Oxygen is approximately 21% of the air we breathe.
Oxygen
Oxygen
20.95% is oxygen
Oxygen
Oxygen is the gas that accounts for about 20 percent of Earth's atmosphere.
Oxygen is a non-metal gas that makes up about 20% of normal air.
Oxygen
The air we breathe is: about 78% Nitrogen about 20% Oxygen about 1% Argon and the rest lots of other chemicals in tiny amounts.
Oxygen gas makes up just over 20% of the air around us.
Nitrogen, you can't survive on it obviously but you breath it in every day it is the most abundant gas in the atmosphere followed by oxygen I think.
The difference - is in the proportion of the gasses present. The air we breathe in contains about 20% Oxygen. What we breathe out has about 16% oxygen and high levels of carbon dioxide.