We've had this contraption floating around our classroom for a few weeks now, and it sure does provide a lot of entertainment!
Materials:
2 2-liter bottles
1 1" washer
masking tape
By swirling the top bottle it creates a vortex and then a tornado funnel appears.Materials:
2 2-liter bottles
1 1" washer
masking tape
http://oceanservice.noaa.gov/education/for_fun/TornadoBottle.pdf
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