Written Narration : The Wonder Book of Chemistry

Uncle Paul says that experimenting is the only way to learn quickly.  Air is also matter known as gas, it is invisible.  In small quantities it is invisible but in large quantities it is not true.  Uncle Paul filled a water bottle with water and invert it and put a straw in it.  He then blowed air into the water bottle.  The air floats to the bottom of the inverted bottle.  Another experiment is when you fill a cup of water and put a damp paper at its lid and flip it upside down, you can remove your hand, and the piece of paper still sticks on the mouth until you remove it.