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Facts on Air

This lesson teaches you some important facts on air.


Facts on Air


What is air?


Air is a mixture of gases. It covers the Earth in a layer, which is called atmosphere.


Can you feel air? Yes

When the air is moving we can feel it. Moving air is called wind.

E.g. – When you run or cycle you can feel the air is blowing on your face and body.


Can you hear air? Yes.

E.g. – On a windy day as the air rushes through the trees we can hear it.


Can you see air? No.


Does air have a colour? No.


Can you taste air? No.


Can you smell air? No. Clean air does not have a smell.


What are the main characteristics of air?

  • Air is invisible (Air cannot be seen)
  • Air is colourless (Air doesn’t have a colour)
  • Air is tasteless (Air doesn’t have a taste)
  • Air is Odourless or scent free (Air doesn’t have a smell)
  • Air can escape through the smallest hole of the container which it is kept


What does air include?

  • Gases


    Nitrogen 78%

    Oxygen 21%

    Carbon dioxide 0.03%

    Noble gases 0.97% (Helium, Argon, Krypton)


  • Water Vapour (The amount changes)
  • Tiny winey particles of dust (The amount changes)


Gases in the Air


Composition of air


Are the gases in the air important for us?


Yes, the gases in the air are important for us in many ways.




NitrogenToo much of oxygen is dangerous for humans. Nitrogen reduces the strength or flavour of oxygen in the air.
  1. Used by humans and animals to breath.
  2. Used by humans and animals to turn the food we eat into energy.
  3. Used by fires to burn.
Carbon dioxide
  1. Used by plants to breathe.
  2. Used by plants to make food.
  1. Used in filling balloons.
  1. Used in filling light bulbs.
  2. Used in welding (join two pieces of metal together by heating).
  1. Used in powerful bulbs that shine through fog (thick mist).


Hope you learned a lot of interesting facts on air.

Also, read the lesson Oxygen in air.