Question

Percentage of oxygen in air by volume ………​

Answer 1

Answer:

21 percent

Air is mostly gas

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

Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent

Answer 2

Answer:

21percent

Explanation:Air is all around us, but we can’t see it. So what is air, exactly? It’s a mixture of different gases. The 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.