Question

What is the percentage of oxygen in air?
ANSWER QUICKLY​

Answer 1

Answer:

21 percent

Air is mostly gas

Air is mostly gasThe air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen

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Answer 2

$\huge\fbox \red{21 percent}$

More information

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.