Air
From Simple English Wikipedia, the free encyclopedia
- Air is one of the four classical elements – air, water, earth, and fire.

A fan is used to move air.
Air means Earth's atmosphere. It is the clear gas we live in and breathe in. It has no color or smell. But it has weight. Air creates atmosphere pressure. There are no air in the vacuum and cosmos.
Air is a mixture of 78.03% Nitrogen, 20.99% Oxygen, 0.94% Argon, 0.03% Carbon Dioxide, 0.01% Hydrogen, 0.00123% Neon, 0.0004% Helium, 0.00005% Krypton, 0.000006% Xenon.
We need the oxygen in the air to live. In our bodies, the lungs give oxygen to the blood, and give back carbon dioxide to the air.
The wind is moving air. Air can be polluted from gas, smoke, and ash. This pollution is one of the causes of global warming. Plants and animals also need air to live.