Procedure

How to prove that air is there, despite the fact that, like most gases, it is invisible.

What you need:

  • a balloon
  • a good set of lungs 

What you do:
1. Blow up your balloon, and hold the end tightly so that no air escapes.
2. Holding onto the balloon, release the end and feel the air blow into your face.

Explanation

 

Why can we feel air from a deflating balloon when we can’t see it?

Air is made up of different gases including oxygen, carbon dioxide and water vapour. These and other gases are usually invisible and spread out to fill up spaces.

When you feel air from a deflating balloon blowing into your face, you are feeling the invisible gases that make up air hitting your skin.

Air that is moving is called wind.

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