The way I do this is to place a funnel into the end of the vacuum
cleaner and then a table tennis ball (ping pong ball) inside the funnel.
Another that I do: a 35-45cm (14-18in) piece of 1.5-2.5cm (0.5-1.0in)
tubing placed above a beaker or small bowl of rice. Have the vacuum
blowing across the top of the tubing...
[The air moving across the top of the tube reduces the air pressure
allowing the greater air pressure ouside the tube to push the rice up;
the air from the vacuum then carries it out into the classroom...the
students love it!! good for explaining perfume atomisers as well as old
fashioned pump sprays.]
You have some interesting ideas on your site. Thankyou for the effort.
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