Using Air/Pushing Air
Did you know that air pushed against you all the time?
You cannot feel air pushing in on you because your body pushes
outwards with the same force as the air. In outer space, where
there is no air, astronauts have to wear pressurized space suits
that push against their bodies with the same forces as the air
on earth.
Without air we could not live. We cannot see it or smell
it, but we can feel it when it moves. Just like water, air has
many uses. Sailing boats have large sails which catch the wind
to push them through the water. Windmills harness the power of
the wind to grind wheat into flour or make electricity.
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