For this experiment, you need 2 x 2L soft drink bottles, attached neck to neck, with a plastic tube going towards the end of each bottle. To make this at home, you need a plastic sleeve into which one screws two empty 2-liter soft-drink bottles (you could glue two lids together to do this).Inserted into this connecting tube are two clear plastic "straws", one extending toward the bottom of each bottle. Fill one bottle 3/4 full of water, colored if you like, invert the duo, and watch water spew from the top end of the top "straw".
We bought a pre-made connector from here:
http://www.windmill.net.au/Age/8+/BC12976-Fountain-Connection.html
The water spurts into the upper bottle due to the vacuum created as water drains from one bottle to the other, but it looks as though the water defies gravity. I reckon this is a good physics demonstration!
We also did a similar experiment with the tornado tube.
You can find the instructions for this one here: http://www.csiro.au/helix/sciencemail/activities/TornadoTube.html
1 comments:
i love this idea. I have been thinking about trying to make an egg timer in a similar way.
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