CONVECTION FAN | Gujarati
Channel: Arvind Gupta
Date: 22/12/2016

This experiment is about a chimney through which hot air comes out and spins a fan. This is called the Convection Fan. You will need an old card box, paper, scissors, candle and rubber glue. Take a 5-cm square and fold both its midlines and diagonals. Then draw the blue lines for the fan blades and cut them with the scissors. Fold the blades and pinch the middle to make a pyramid. You can see the pyramid from below. Perch the fan on a pin point. The fan should rotate smoothly on the pin. Then mark a piece of cardboard and cut it to make the chimney. Apply rubber adhesive on all the flaps. Notice the 4 rectangular flaps on the lower edge. These small windows will be the inlet for the air from outside. Assemble the chimney once the glue dries up. The chimney will be a tall rectangular box with a pyramid on the top. On the apex of the pyramid will be the chimney hole for the hot air to exit. Now you can clearly see the inlet “air vents”. The white spot from below is the chimney hole. Finally apply some rubber glue and stick the pin and then perch the paper fan on top. The fan must spin freely on the pin tip. 
Now place the chimney on top of a lighted candle. Take a deep breath and wait for about 20 seconds. Soon hot air from the candle will rise up from the chimney hole and spin the fan. Cold air will be sucked in from the vent holes. Hot air being lighter will exit from chimney and rotate the fan. You can also make a transparent chimney using an old CD box and the top of a plastic bottle. 

This work is supported by IUCAA (www.iucaa.in) and TATA Trust (http://www.tatatrusts.org/) and (www.tata.com/aboutus/sub_index/Tata-trusts)

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

Credits:,Ashok Rupner, Manish Jain, Pradnya Pujari, Shivaji Mane, Jyoti Hiremath, Arvind Gupta, Vidula Mhaiskar

Dubbed in Gujarati by Vanisha Shah