Air

 

Have you ever been inside a room or a closed vehicle for a long time and felt uncomfortable, have you heard elders asking you to go out and get some fresh air? Have you wondered what this air is? How it impacts us?

There are many gases that surround our earth, the combination of these gases in earth’s atmosphere is called air. The most common gases are nitrogen , oxygen, carbon dioxide. Other molecules are present in the atmosphere as well, but in very small quantity. Each of these gases interact with our environment and body, so its useful to know more about air.

The layers of the Atmosphere

The atmosphere is comprised of layers based on temperature. These layers are the troposphere and stratosphere.

  • The troposphere is the lowest layer of Earth’s atmosphere and is also where nearly all weather conditions takes place. It contains 99% of the total mass of water vapor. The average depth of the troposphere is 20 km and clouds are formed in this layer.
  • The stratosphere is the layer of the earth's atmosphere above the troposphere, extending to about 50 km above the earth's surface. Planes fly in this layer.


 

Importance of Atmosphere

The atmosphere makes Earth conducive for life. It blocks some of the Sun's dangerous rays from reaching the surface. It traps heat, making Earth temperature for us. The oxygen within the atmosphere is one of the most essential for life.

Properties of Air

Air is a mixture of gases consisting of approximately 4/5 Nitrogen and 1/5 Oxygen. Like all matter, air has weight and takes up space. It can also be compressed, unlike solids and liquids.