Bernoulli Balloon | English | Fun with Air

This is a wonderful experiment showing Bernoulli’s Theorem. We will need two paper cups, knife, two straws, scissors and a balloon. First we will make a hole in the base of each paper cup. Then we will press fit a bendable straw in the holes of both cups. Then we will make a few slits on the surface of one paper cup so that the air blown through the straw can pass through. Then we will inflate the balloon to half. Now we will have two cups with straws. One cup will have slits the other will have no slits.
Now we will place the inflated balloon in the cup without the slit and blow through the straw. No matter how hard we blow the balloon does not fall. We can also invert with the balloon down. On blowing the unsupported balloon will also not fall. We can test this again and again. Now repeat the same experiment using the cup with the slits. On blowing through the straw the balloon will rise in the air. Why does this happen?
On blowing through the plain cup air comes out at a high velocity and creates a low-pressure zone sucking the balloon on the cup. On the other hand when air is blown in the cup with the slits most of the air escaping through the slits is at atmospheric pressure and some of the air goes up lifting the balloon. This is a wonderful way to illustrate Bernoulli’s principle. 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 the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA's Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit www.tatatrusts.org

Видео Bernoulli Balloon | English | Fun with Air канала Arvind Gupta