Chapter: SCIENCE EXPERIMENTS & AMUSEMENTS FOR CHILDREN BY CHARLES VIVIAN. Simple Technical Steped Practical Projects for school and college students.
Let Air Show Its Muscles
Let Air Show Its Muscles
You will need: A balloon, three or four books.
Have you ever noticed a car
with a flat tire? The vehicle is no longer horizontal but sags at that end
where the air has been released from the tire.
If you could reach the axle
of the car immediately above the flat tire, you would probably find your
strength insufficient to raise the end of the car at all.
Yet when air is pumped back
into the tire the car is gradually lifted. Air pressure can raise the weight of
quite heavy trucks in this fashion.
A similar experiment to
test the lifting strength of air pressure can be performed with a toy balloon
and a few books. Secure three or four books with rubber bands or string and
place them on top of a toy balloon. Place the balloon so that the mouthpiece
overhangs the edge of the table.
Take a deep breath and blow
steadily into the balloon. You will be surprised to see how easily the end of
the pile of books is raised into the air. See if you can lift more books than your
friend, in this fashion.
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