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how do you make a tornado in one bottle? Answered

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DELETED_Haon (author)2009-11-06

 fill a bottle 3/4 the way with water and add 2 tbsp of dish soap and 1 marble close the lid and move in a curcular motion

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AndyGadget (author)2009-04-27

I nearly sent you off to Google, but I see there is a twist to your question - you want a tornado in a SINGLE bottle - not the usual one on top of the other arrangement. The best way I can think of is to put a small bar magnet in the bottle and have a motor spinning underneath also with a bar magnet. This would give you a pretty good vortex, and is the way some laboratory stirrers work.

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