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 main gas found in the air we breathe is nitrogen, which makes up about 78% of the Earth's atmosphere. Oxygen is the second most abundant gas, making up about 21% of the air.
Oxygen gas makes up just over 20% of the air around us.
Nitrogen is the most abundant gas in Earth's atmosphere, making up about 78% of the air we breathe. Oxygen is the second most abundant gas, comprising roughly 21% of the atmosphere.
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.