Question

The proportion of nitrogen in air is _____________ %​

Answer 1

Answer:

78 percent

Explanation:

Air is composed of 78 percent nitrogen.

Oxygen accounts for 21 percent, and

the inert noble gas argon makes up

0.9 percent of the air. The remaining 0.1

percent consists of several trace gases.

Answer 2

Answer:

Atmosphere | National Geographic Society An atmosphere is the layers of gases surrounding a planet or other celestial body. Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases.