What is the most common gas in the air we breathe?

Hints

It makes up about 78% of Earth's atmosphere
Plants need it to grow.
Its chemical symbol is N.

Reveal the answer

Answer: Nitrogen

Also accepted: Nitrogen gas

Most people guess oxygen, but oxygen makes up only about 21% of the air. Nitrogen makes up around 78%, with the last 1% mostly argon plus tiny amounts of carbon dioxide and other gases. Our bodies breathe nitrogen in and out without using it. Plants need it to grow, though, which is why it's a key ingredient in fertiliser.

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