Wondering about the air around us!

Air is all around us but we can’t see it. It is invisible. So how do we know that it’s there? Let’s test it.

Look at the picture on the right. The girl is blowing up a balloon. She is filling it up with air. Now look at the balloons that are falling around her. Air is coming out of those balloons as they deflate and fall to the ground. Can you think of some other ways to show that air is all around us?