This page from the Exploratorium shows how to build a model of a tornado or a whirlpool with two empty one-liter bottles. Along with directions, a discussion of the physics is provided.
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Keywords:Informal Education,Middle School,NSDL,High School,tornado,Engineering,Dynamics of Fluids,Geoscience,vortex,Elementary School,NSDL_SetSpec_439869,Vocational/Professional Development Education,twister,Physics,Vorticies,Fluid Mechanics,oai:nsdl.org:2200/20080304154716272T
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