schoolscienceproject.blogspot.in
Shooting
backwards
Hold an empty
bottle horizontal and place a small paper ball lust inside its neck. Try to
blow the ball into the bottle. You cannot! Instead of going into the bottle,
the ball flies towards your face. When you blow, the air pressure in the bottle
is increased, and at the same time there is a partial vacuum just inside the
neck. The pressures become equalised so that the ball is driven out as from an
airgun.
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