Oxygen
Oxygen
Typically, the air you breathe is comprised of 18 to 21 percent Oxygen.
20% of 20% is 4% (=0.04)
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Oxygen
Oxygen
Oxygen is approximately 21% of the air we breathe.
20.95% is oxygen
Oxygen is the second most common/abundant gas in the air that we breathe. Nitrogen is the most abundant gas in the air we breathe. The composition of air is often treated as 79 mole or volume percent N2 and 21 mole or volume percent O2.
In 2006, about 20 percent from natural gas
Oxygen is the gas that accounts for about 20 percent of Earth's atmosphere.
Oxygen is the second most common/abundant gas in the air that we breathe. Nitrogen is the most abundant gas in the air we breathe. The composition of air is often treated as 79 mole or volume percent N2 and 21 mole or volume percent O2.
Nitrogen which makes up about 78 percent of the atmosphere.
Oxygen
Carbon dioxide is the gas you breathe out the second most. Oxygen is the gas you breathe out the most.
The air you breathe comprises three main gases. The largest proportion (79%) comprises the inert gas nitrogen, with oxygen making up 21 percent and carbon dioxide just 0.03 percent