Soap Pearl | Urdu
Channel: Arvind Gupta
Date: 03/02/2017

This floating droplet experiment can be easily done using diluted liquid soap solution and a syringe. Fill the syringe with the solution and then start dropping it on the liquid surface. If the height is right you will find that the drops instead of mixing with the liquid in the bowl float on it. As more droplets fall they coalesce amongst themselves before mixing into the background liquid. These droplets float for a significant amount of time so you can easily observe them. What is happening is that the soap molecules at the interface resist coalescence. This added resistance allows the droplets to float on the surface for a significant amount of time. That is why you see these wonderfully floating and dancing droplets. 

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 Urdu by Ishrat Shaik and Naziya Shaik from Pratham's Science Learning Program