Oxygen
Oxygen
100%. All of the oxygen that I breathe comes from the air! The answer that you were probably after, but did not ask, was about the percentage of oxygen in the air that we breathe. The questions may sound similar but they are not the same. The answer is a little over 20%.
20% of 20% is 4% (=0.04)
7 of out 20 in percent is (7/20)*100 = 35 percent.
Oxygen makes up about 20% of Earth's atmosphere.
Oxygen
Oxygen is approximately 21% of the air we breathe.
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
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.
Animals need AIR to breath in - AIR is made up of about 80% Nitrogen and 20% Oxygen. The animals use the Oxygen in the AIR.NOTE if an animal were to breath 100% Oxygen this would eventually kill it, Pure Oxygen is toxic.They need to breath AIR.
Approximately 16% of the volume of exhaled air is oxygen. The rest is mostly nitrogen, with small amounts of carbon dioxide and other gases.
20 Percent.
Oxygen