a clean and dry recycled plastic drinks
bottle, one that is easy to hold with
- Roll up a bit piece of paper
into a small ball that will fit
easily into the opening of the drinks
- Hold the plastic bottle so that
it is horizontal. Rest
the ball of paper just inside
the neck/opening of the plastic
- Hold the bottle with the ball
up close to your mouth and blow
into the opening.
- Go on; try it again and again
- What happens each time?
a go at trying this experiment with
different sized (openings) drinks
bottles and different types of paper
(tissue, tin foil, tracing paper)
is how it works - The air that
you blow into the bottle hits
the back or bottom of the bottle
and bounces back out the opening
of the bottle and forces the
paper ball to blow out.