Make a large cone from a newspaper with a cardboard thread reel on one end. On blowing from the reel end the two layers of the newspaper will come close and hit each other. The high velocity of air creates a low pressure zone which collapses the cone.
http://www.arvindguptatoys.com/toys/bernoulli.html This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to
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