BOYLES BALLOON IN BOTTLE | Telugu
Channel: Arvind Gupta
Date: 2016-12-29

In the 17th century the British scientist Robert Boyle observed that at constant temperature the product of the Pressure (P) and Volume (V) remains almost a CONSTANT (PV = Constant). We can test this through a simple experiment. We will need a Cycle Valve from an old cycle tube. Affix this Cycle Valve on a 2-litre bottle lid. Fix the inside of the valve with the rubber tube and then screw on the nut. This is a ONE-WAY Valve. It allows air to enter but prevents it from escaping. Place a bent straw in a 2-litre bottle. The purpose of the straw is to provide an exit for the air when you blow the balloon. Place a balloon in the bottle and blow the balloon with your mouth. As the balloon inflates air will escape from the bottle through the straw. Tie a knot on the mouth of the balloon and place it inside the bottle. Remove the straw. The fully blown balloon will press against the sides of the bottle and no matter how hard you try it will not move up or down even on shaking the bottle. Then screw on the lid with the valve. Attach the valve to the Cycle Pump Hose. Now pump air in the bottle. As you pump air in the bottle the Air Pressure in the bottle will increase and the Volume of the Balloon will shrink. After a while the Balloon will shrink enough and fall inside the bottle. You can visibly see that as the Pressure (P) increases the Volume (V) of the Balloon decreases.
Now open the Valve and let the pressurized air escape. As the Pressure decreases in the bottle the balloon again bloats and inflates – reaffirming the fact that the product of Pressure and Volume is almost a constant!

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 Telugu by Sri Prakash Vidyaniketan