EVERYDAY SCIENCE

Detailed explanation-1: -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 other gases, too, such as carbon dioxide, neon, and hydrogen.

Detailed explanation-2: -Nitrogen is more in the air because it is least reactive and nitrogen is generated and maintained in this natural equilibrium by plants and surface soil bacteria, who convert it to ammonium, nitrites, and nitrates before releasing it as free nitrogen back into the atmosphere.

Detailed explanation-3: -While we breathe, we inhale oxygen along with nitrogen and carbon dioxide which co-exist in air. The inhaled air reaches lungs and enters alveoli where oxygen diffuses out from alveoli into blood, which enters into lungs via pulmonary capillaries, and carbon dioxide diffuses into alveoli from blood.

Detailed explanation-4: -The troposphere also contains water in all three phases (liquid, solid, and gas) as well as solid particles called aerosols. The dry composition of the atmosphere is mostly nitrogen and oxygen.

Detailed explanation-5: -Molecules in the air include primarily nitrogen and oxygen as well as water, carbon dioxide, ozone, and many other compounds in trace amounts, some created naturally, others the result of human activity.